Gun control:
First, select a sidearm, rifle, carbine, pistol, revolver, bolt-action, semi-automatic, or whatever, the fits in your hand with arm outstretched, or rises and nestles easily into your shoulder, while allowing your eye to sight through the aiming sights, either through a scope or at a zeroed-in distant target with the aid of the optical notches and crosshairs, then thoroughly familiarize yourself with the actions and the trigger mechanism. Little things like the safety, bolt action (if so equipped), the slide action (if a semi-automatic pistol), and the magazine loading method. Be aware of how the spent cartridge is ejected, and assure that it drops away without striking you or your immediate neighbor.
When it comes to actually using the sidearm for the purpose for which it was designed, first snap off the safety, while keeping the muzzle of the weapon pointed AWAY from anything you do not wish to shoot, but always in a direction that sweeps toward the target. Then select and frame the target, sighting through the aiming device on the weapon, after raising the weapon to firing position. When the muzzle is directed on the target, press firmly on the trigger, while bracing for the recoil. After the discharge, either jack another round in the chamber, or if fed from a magazine, allow the weapon to go through the eject-reload sequence. Repeat the steps until the sumbyitch falls down.
Still ISO that 120 round mag for my Taurus G2C.