Start from the failure, not the goal
Every evaluation has exactly two endings. You reach the target, or you touch a limit. The second one is faster, more likely and entirely under your control — so plan it first.
Write down the three numbers that end the account: your maximum loss line today, your daily loss limit, and the loss that would take you from comfortable to desperate. Everything else in this guide follows from those.
Size against the drawdown, not the balance
Risking 1% of a $50K account sounds conservative until you notice the trailing drawdown is $2,000. That $500 trade is a quarter of everything you have. Four of them, spread over two weeks, and a perfectly normal losing run has ended the evaluation.
A more honest denominator is the room you have left. Risking 5% to 10% of your remaining drawdown per trade means a losing streak shrinks your size automatically, which is what you want and what fixed-percentage sizing does not do.
The position size calculator converts that into contracts, with a check against your daily loss limit.
Set a daily stop that is tighter than the firm's
If the firm's limit is $1,000, yours is $500. The firm's number is where the account dies; yours is where the day dies. They should never be the same number, because hitting the firm's limit means you were still trading while you were down $900 — and nobody's judgement is intact at that point.
Two losing trades, or a fixed dollar figure, then the platform closes. Not "one more setup". The evaluation has no time limit; tomorrow costs nothing.
Respect the high water mark
On a trailing account, every new equity high permanently raises the floor. That makes giving back open profit far more expensive than it feels — on an intraday-trailing firm you pay for the give-back twice, once in P&L and once in cushion.
Practical consequence: partial profits and a stop that moves to breakeven are worth more on a prop account than on your own money. You are not just protecting the trade, you are protecting the line.
Trade fewer instruments and fewer hours
Evaluations are usually lost outside the window where the trader actually has an edge — the late-morning chop, the second session, the revenge hour. A written session ("I trade 9:30 to 11:30 New York, MNQ only") removes most of the trades that fail accounts.
It also makes your journal readable. Twenty trades in one setup tell you something; twenty trades across six instruments tell you nothing.
Treat the target as a by-product
The last stretch of a challenge is where accounts die. You can see the finish, the size creeps up, and the trailing line is now sitting just under your balance because of the run that got you there.
The reframe that works: you are not trying to reach the target, you are trying to survive long enough that the target arrives. Keep the same size, keep the same stop, let the arithmetic finish.
Check the consistency rule before you need it
If your firm has one, your best day cannot exceed a set share of total profit. Traders discover it at payout, weeks after the day that caused it. Check it as you go — the number only ever gets harder to fix.
Run it through the consistency calculator once a week, not once at the end.
Write down the day, every day
Not for the trades — for the numbers. What was your room this morning, what is it now, what moved it. Five lines. Traders who do this stop breaching limits by accident, and the ones who breach anyway at least know why.
A journal that already knows your firm's rules does this arithmetic for you, on every account, which is the only reason Propbook exists.
Track the rules instead of remembering them
Propbook keeps your drawdown, daily loss, target and consistency live on every account you trade, and warns you on Telegram before a limit is crossed. Free, no card.
Open Propbook →FAQ
How long should a prop firm challenge take?
Longer than you want. With no time limit on most evaluations, the only real deadline is your own patience — and rushing is the single most common cause of failure.
What percentage should I risk per trade?
Against the balance, 0.25% to 0.5% is a common answer, but the better denominator on a funded account is the remaining drawdown: 5% to 10% of the room you have left per trade keeps your size honest during a losing run.
Should I trade micros or minis?
On a $25K or $50K evaluation with a $1,500 to $2,000 drawdown, micros are what make sensible stops possible. One mini contract on NQ risks $20 a point — a 30-point stop is $600, nearly a third of the account's room.
Is it worth running several evaluations at once?
It raises your chance of one passing and multiplies the number of rules you have to track. Only do it if you have a system for the tracking — and the same trade sized separately for each account's room.