A Limit Set in the Moment Is Not a Limit
Personal minimums decided while looking at today's weather are not minimums. They are a rationalisation with a number attached. The entire mechanism depends on the limit being chosen at a time when you have nothing at stake in the answer — which means in advance, in writing, and specific enough that today's conditions either clear it or do not.
Write Numbers, Not Adjectives
"Good visibility" is not a limit. A ceiling in feet, a visibility in miles, a crosswind component in knots, and separate figures for day and night are limits, because they can be compared against a forecast without interpretation. The narrower the wording, the less room there is to argue yourself across it on a morning when you would like to go.
Raise Them Deliberately, Not Gradually
Minimums should move as you gain currency and experience — but as a decision made on the ground, reviewed against your recent flying, not as a drift that happens one marginal flight at a time. Write down the new number and the reason for it. A limit that quietly loosens every time it is inconvenient was never doing any work.
Letting the Tool Hold the Line
Once your limits are set in FlightReady they are applied as their own weighted factor on every later assessment, and an exceedance is flagged rather than left for you to notice. Schools can share a baseline across seats so a program has one standard instead of one per instructor. The software holds the number you chose. Whether to accept an exceedance is still yours, and it should be — the point is that you are now knowingly overriding a limit rather than never quite noticing you crossed it.