Make a weakness a strength. That's the goal of practice.
Is the first stage of the match a weakness for you? Do you shoot that first stage poorly and then settle down and shoot the rest of the match well?
If so, start shooting a stage first thing when you set up for a practice session. Make the stage the very first thing you do. Change the scenario for each practice session. Make it complicated, make it simple, but keep changing it. Soon you won't mind shooting that first stage at a match.
Doc