Always keep up with WHEN you're next-standby-next position (in the gate) and during that downtime, do a mental walkthrough of the target succession and no of shots for each, and repeat several times mentally. Second, keep your thoughts on what/when and slow down for accuracy when the buzzer sounds the GO!
Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem. Ronald Reagan, 1985