The first match is always the most humbling. It gets better, buzzer shock plays a big part in stuff like that too.
I have found that I am switching my carry gear to find a way to carry and shoot IDPA with the same gear in the same positions so my "muscle memory" doesn't get confused.
I don't worry about winning or even competing, except against myself. Shoot for the sake of improving accuracy first and you'll be surprised how much faster you get.
Bandage yourself up and hit the range (or a safe room in your house) to do some dry fire/cold gun drills. That type of practice has helped me more than actual trigger time.