Become so prepared that pressure has less new information to introduce.

Pressure disrupts by introducing things you have not encountered before, so the amount of preparation you did determines how much of a stressful moment is genuinely new. Someone thoroughly prepared meets a familiar situation with elevated stakes, which is a much smaller problem.

Before something high-stakes, work through the variations in advance. The goal is to reduce the novelty. Whatever you have already thought about arrives as recognition rather than surprise.