Just go to have fun, be safe and enjoy the experience. There will be all levels of shooters, some will be fast and others not. Don't worry about how anyone else is shooting. Just go through the stages with your focus on safety and getting good hits. Expect your mind to go blank when the timer buzzes, don't worry it happens to everyone in some form. My overall advice for your first time goes back to my first sentance. Have fun, be safe and enjoy the experience. Let us know how it goes.