When to walk, when to admit you're wrong

The worst losses in my account never came from buying wrong. When I bought, I felt I'd thought it through. The real damage was all in the selling — too greedy to walk when I should have, too stubborn to admit it when I should have. By the time I came to my senses, I'd either turned a gain into a loss, or held a small loss into a big one.

Later I figured it out: buying is a decision made by the calm you, but selling is usually made by the worked-up you. When it rises you're controlled by greed; when it falls you're controlled by fear — expecting yourself in either of those states to make a good decision was never realistic. So this piece doesn't teach you to read charts; it's about one thing only: how to take the power to sell out of the hands of the hot-headed you, and hand it in advance to the cool-headed you.

Set the rules when nothing's happening and your head is clear

The core is just this: all entry and exit rules should be set, and written down, when nothing's happening and your pulse is steady.

Why? Because the moment the market really moves, you're no longer your usual self. As it rockets up, your head is full of “wait a bit, it could go higher still”; as it cascades down, your head is full of “hold a bit longer, it'll bounce.” In both states, you make decisions you'll almost certainly regret later.

The point of setting rules in advance is that the on-the-spot you doesn't have to decide — only execute. The rule is a note the calm you leaves for the worked-up you: “You're here. Follow this. Don't ask why.” Before I buy anything now, I first ask myself three questions and record the answers in a memo:

Why am I buying it? At what level do I start selling? What would make me admit I'm wrong and walk?

If I can't answer those three, I don't buy. Because not being able to answer means I haven't thought it through yet — and thinking it through can only happen before you buy. Once you're in and the market moves, that calm is gone.

Take profit in batches: get your principal back first

Let's start with handling gains, which actually tests you harder than losses do. After it's risen, most people get stuck on one thing: sell and fear missing the rest, hold and fear giving it back. Caught both ways, they usually just wait — until a run finishes and falls back, all for nothing.

My approach is not to chase the top — nobody sells the top, and chasing it is itself the start of losing money. I take profit in batches: sell a portion once it has risen to a certain point, rather than betting on one perfect moment to dump it all.

The most important step is, when it has risen enough to recover your principal, sell off the part that covers your principal first. A simple example: you put in $10,000; when it rises to $20,000, you sell half and bank that $10,000 of principal. The other half is pure profit riding on. From that moment, this investment can no longer lose for you — the worst case is the profit half gives some back, while your principal is untouched.

The change in mindset this brings is huge. Once your principal is back, you hold the rest much more easily: if it rises, you make more; if it falls, you don't ache, since it's only profit. The reason so many can't hold through a fall is that their principal is still in play, so every dip stings. Pull your principal out first, and you can genuinely hold the rest of the position.

The give-up line: watch the logic, not the indicator

Now losses. Plenty of guides teach you to set a stop loss with technical indicators — walk when it breaks a moving average, clear out when it breaks a support. I don't do that, and at the beginner stage I strongly advise against it, because you'll most likely misread those lines, get whipsawed back and forth, and end up cutting your losses repeatedly at the most painful spots.

What I use is a “give-up line,” and it watches only two things:

• Whether the reason you bought it still holds. There was always a reason when you bought — you liked this project, you liked this direction. If reality has overturned that reason (the project hit a serious problem, the thesis was disproven), then it's time to give up, regardless of the price. Even if it hasn't fallen yet, a changed logic means you should trim.
• Whether this position is keeping you up at night. If a holding has you anxious every day, waking up to check the screen, bleeding into your normal life — then no matter whether it's up or down on paper, it tells you that part of your position is too heavy. Trim it, down to where you can sleep.

What these two share is that they look at the relationship between you and the investment, not at some point on a candlestick chart. If the logic hasn't changed and you can still sleep, how much it falls short term shouldn't move you — a 30% drop in crypto is routine, which I cover specifically in how not to scare yourself into selling during a crash. The logic changing, or you losing sleep, is the real signal to leave.

In the end, admitting you're wrong isn't admitting defeat — it's acknowledging “my original call was wrong” or “I sized this too heavy.” People who can give up cleanly actually last longer. What's most dangerous is stubbornness: the logic collapsed long ago, yet you invent reasons to convince yourself to keep holding.

Why you don't rewrite the rules mid-move

Once the rules are set, the biggest test arrives: the moment the market moves, you'll desperately want to change them.

When the take-profit level hits, you'll think “wait a bit, this trend isn't done”; when the give-up line breaks, you'll think “so close, just hold through this wave and it'll come back.” These thoughts all sound reasonable, but almost all of them are emotion dressed up as judgment.

How to tell a real change of mind from emotion at work? A simple test: if the direction you want to change in happens to be the one that makes you “feel more comfortable right now,” it's most likely emotion changing it. Wanting to raise your take-profit target when it rises (because you can't bear to sell), wanting to lower your give-up line when it falls (because you don't want to take the loss) — both moves make the present you more comfortable, and both are the ones you'll most regret later.

Of course rules can be changed, but there's an iron rule: only change them outside a move, never inside one. After the wave passes, the price is no longer so charged, and your head has cooled, then go back and review whether the rule made sense. What you change then is judgment; what you change mid-move is basically impulse.

The two most common ways to die

On the matter of selling, the two deaths I see most among beginners happen to be exact opposites:

• Holding all the way to zero. The reason to buy collapsed long ago and the price keeps making new lows, but you just won't admit it, always thinking “it's fallen so much already, how much lower can it go?” The answer turns out to be: all the way to zero. That's the fate of “refusing to ever admit you're wrong.”
• Panic-selling at the first dip. The logic hasn't changed and the position isn't heavy, but one swing in price scares you into clearing out, you sell at the bottom, and then you watch it bounce right back. That's “failing to hold when you should have.”

See — these two problems look opposite on the surface, but the root is the same: no rules set in advance, every decision made on present emotion. A person with rules asks “has the logic changed?” first when it falls, rather than being scared off by the price; and gives up cleanly when they should, rather than holding to the bitter end indefinitely. Rules don't guarantee you make money, but they pull you most of the way out of “being led by the nose by emotion.”

Recap: hand the call to your calm self

Condensed to one sentence: while your head is clear, write down your entry and exit rules — take profit in batches (recover principal first), set a give-up line by logic, never rewrite mid-move. Selling is hard precisely because you keep trying to make a decision that should be calm while you're worked up. Setting the rules in advance hands that decision back to the calm you.

However well the rules are set, you can't dodge the true crash moment — the account a sea of red, your fingers shaking. The next piece is about exactly that: during the crash days, how not to scare yourself into selling.