Being as comfortable as circumstances allow helps you keep your concentration. Regular sunglasses will usually do for the required eye protection during the day, but clear glasses are necessary for low-light shooting. Sunglasses will not work at night. A sport-type bra is very helpful for some. This will prevent hot brass cases from going down your front and lodging next to your skin.
Dehydration can be a serious problem.
On very warm days, drink plenty of water to keep from dehydrating. Keep your finger off the trigger, manual safety on, and the muzzle pointed upward, as you place the weapon between your feet after you have lowered your trousers. Sidearms go between your feet also. It is permissible to place the longarm against the wall so long as it is close and you maintain direct control over it. When you are finished, tuck in your shirt and buckle your belt.