After downloading the mod, use a program such as 7zip or WinRAR to extract the main folder of the mod.
Navigate to assets/mod_overrides. The assets folder is supposed to be in your game's installation folder (don't know where that is? click here). Create the folder if necessary
Move the main folder of the mod from step 1 to the folder you navigated to in step 2.
eyeAim is optional for some added camera movements.
CAFCW is needed for custom pistol red dot support.
Weapon Painter is needed for the Sand Viper variant on the Pit Viper pistol.
Otherwise, the mod isnt necessary.