I would like to start by saying that I am not a competition shooter by any stretch of the imagination. I fit into the weekend warrior class, 1 weekend a month if I am lucky to have the time off work to get to a small steel match. That being said, I have been a top notch competitor in billiards for almost 20 years. One would be surprised what carries over between the two. I would like to share what I use in both that help work out some of the mental bugs that can plague during competition that are not a problem during practice.
1. Compete how you practice. This should seem like a no brainer, but you would be surprised at those that miss it. If you wear certain clothes while competing, practice in them. If you listen to music while competing ( if allowed ), practice with it and vise-versa. The whole point of practice is to have fun so you can have fun competing and showing off.
2. Have the same warm up routine.
3. Be careful who you practice with. A sloppy shooter will cause you to become a sloppy shooter. You will find that you are only trying to beat them, not beat yourself and become better.
4. Be happy with your gear. Mental doubt can creep in and have your head playing the "if I only had that, I would be better" game and sabotage yourself to fail. It's the shooter, not the gun.
5. The most important; have fun. Especially important when you hit a slump. No one tries to get better at something that is not fun for them. In pool when fun tries to hide, I'll shoot weak handed or one handed, youd be surprised at the skills you can build keeping it fun.