Practice mentally, physically even if you don't dry fire -- go through the motions. Over and over, even if it's just with your finger. Buzzer. The draw. Keep the basics down pat. You'll feel funny saying "bang" when you think you are on target, but do it. Slow is fast!
You won't win, place or show this time. But get this first try out of the way, safely. You'll see how much fun it is and how quickly you speed up down the road, and amaze yourself...
And keep eye protection on at all times please!!!
This above all: to thine own self be true, And it must follow, as the night the day, Thou canst not then be false to any man.