I graduated the FS 4 Day Defensive Handgun course with a G26 and 10-round mags. So you should have no issues with a G19. Whenever you go up to the line to shoot, take all of your loaded mags and also dump a couple of handfuls of ammo in your pockets. Whenever you are not shooting, load your mags. Cargo pants or shorts are a good idea. Good luck. If you can practice your Level I, II, and III malfuction clearing drills before you go then you will be ahead of the game.
The time has come to stand for all we believe in.
Silencing is not a crime.
GSSF Member, Glock Certified Armorer