Prepare in peace for what you may need in pressure.

Skills degrade under stress, which means whatever you can do calmly is roughly the ceiling of what you can do under pressure. Building capacity in peaceful conditions is not overkill; it is accounting for the loss that pressure will impose. Whatever you barely manage on a good day will be out of reach on a bad one.

When you practice something that matters, aim past the level you think you need. Ask what portion of your ability you would lose if you were frightened, tired, or watched. Build enough that even the diminished version is still enough.