Trust isn't something you create at the starting line. It comes from your preparation. Remind yourself that you've done the work and earned the right to trust your training.
During:
Stop trying to control every movement or decision. Trust your body, your preparation, and your instincts to do what they've been trained to do.
After:
Did today's MindRep help you? How did today's MindRep help you? Do you want to own it and make it a consistent part of your training?