I convinced my friend to go with me to an IDPA match, he was reluctant to go previously. I don't know what made him want to go out, but I bought him two more mags (he only had the one that came with his USPc45) and a double mag pouch. He already had a blackhawk serpa and a belt. Those items and his normal clothes and he was good to go for his first match. No big deal. A vest is a good cover garment for IDPA, even if you don't wear one all the time. The point is to get out and have some fun at your own pace.
Bring a camera with you. More than likely one of your new friends will be glad to video your stages.
Watch the vets through each stage. They know how to run the game and you might learn some things from them.
This sounds like a lot to do, but if you show up to the stage with an open mind you'll have a good time.
Eventually your times will drop. Perfect practice makes perfect, and I got a lot of good practice from live fire practical pistol classes and I did informal matches with some friends but it's not the same when you know you're being "graded". The first time I went out for a competition, I don't even remember what really happened, just that the timer beeped and I went into action properly and safely without any thought about it. I had to watch the video of myself to even see what I did the first ten seconds. Subsequent matches slow down, but perceived time is different than elapsed time. Go your own pace and make the hits. You can't miss fast enough to win.
I shoot CDP or ESP, both with SAO guns with hammers- 1911 and a Beretta 92 Steel-I. Short guns are not really at an inherent disadvantage as the ranges to the targets are relatively short.