Since we are dealing with a predictable scheduled situation here, you have plenty of time to rehearse in advance. The time just before you drift off to sleep is an especially powerful time to set new paths in the brain. Like any other practice, the more you rehearse, the better.
See yourself moving through the event easily IN GREAT DETAIL. As you visualize, keep your entire body completely relaxed and your breathing deep and slow and steady. Don’t be concerned if the details you imagine turn out to be slightly different when the time comes. You will have mapped the ideal response into your brain and that will serve you well. The steady breathing is essential because it carries the positive images into your neuromuscular memory.
Be well. Breathe beautifully.
Link: Hill and Valley Breathing