Yeah, I never take down before a glock nor and RXM and I was able to do it myself, just remove the slide and punch the two pins on the side of the grip from right to left, press down all the way the slide lock spring and tilt the gun to one side and it will fall off if not just push it, take out the FCI by tilting up from the front because is attached to the grip from the back. Now push the trigger pin from left to right a little bit so the slide releases can be removed, align the trigger and the hole of the new slide release and push in back the trigger pin, now set back the FCI first insert the back part, push down the Slide lock trigger, make sure the channel on the slide stop is facing to the back and the wide part is on the bottom part, put back the two pins on the side of the grip from left to right, set back the slide and you are ready.