Sounds Great! You will get a "Safety Briefing" before the match. Note specifically gun handling and ammo handling. Watch each stage description, read it again and watch the first folks to shoot it. If you get put up first, ask to go down in the list as you are a first timer. I was 20 years ago, have been an RO, CRO, and currently shoot B Class Limited with a Glock G35 which has been modified within the rules. I also reload all my ammo and have done so since the early 1970's. At 63 YO, I still have fun shooting this game. And all shooting contests are games, it is just how you choose to play the game and the field.
Good Luck and hope you have all "A's".