it just screws in . just make sure u get the right size bead and put a light inheisive on it before you screw it in as so it doesnt fall out again. i thought it was going to be hard too, but i went to a gun smith and he did it for under 5 bucks including the bead it self and i was out the door in20 minutes(half that time was just to shoot the sh*t). if you have one close bywould go that rout. but if not its real easy to do it your self.
good luck
Jeff