For the day of the match, one of the biggest things you can do is put your effort into mental preparation for each stage. Read the course of fire twice, know exactly what shots you will be making from which positions at which targets. Have your dope written down, but also rehearse the stage in your head enough that you could dial your dope from memory. Look at each of the targets in advance (bring binos if you can) and identify them both through the optic as well as looking at exactly where they are with the naked eye. Imagine when you are going to pause and adjust your turret, imagine where you're going to stand/kneel etc. Then triple check all your gear before starting the stage, dope dialed for the first target, no lens caps flipped down, the right number of rounds in your magazine, etc.
Just try to execute each stage according to your plan and to the best of your ability. Laugh it off when you miss a few targets, smile when you hit them. If you want to make a note about what to practice, jot it down on your course of fire paper then forget about any mistakes and move on to the next stage.