Pressure does different things to different people.
Some break, some bend, some just keep on trucking.
And there is no one stressor that effects everyone equally. So preparing for this is difficult at best.

Having seen and experienced the “break” of several people, it has been interesting.
I don’t know that there is really any way to deal with or prepare for the “breaking” level of stress, that trauma. Short of complete desensitization, which is it’s own problem, everything will add to the pile on the camels back. Then what is that last straw?

Personal opinion, learn to deal with the little things.