VERY easy. "Cock" your rifle and close the bolt and ejection port cover. Set the rifle to "safe." Remove the pistol grip via the bolt that runs vertically through the grip and into the receiver with an allen wrench. There's a spring in the grip on the right side; LEAVE IT IN PLACE AND DON'T LOSE IT OR KINK IT!!! There's a detent that rides above this inside the lower receiver; DON'T LOSE IT!!!! Once the tension has been relieved from the safety/selector, withdraw it from the left side. Reinstall in reverse, only exception being when you're done with the actual safety/selector install and you're ready to install the left-handed selector lever on the right side. It has a screw needing an allen wrench. Pretty self-explanatory.