hey it is very easy to do yourself,I think the front sight is a 3/32 or something like that if you use a reguluar socket you will have to grind the OD so it will fit inside the slide and nut very simple, use a vise and wrap the slide in something so it wont get scratched,use a brass punch and drift the old out and drift the new in, once they get about half way in you will have to give it a pretty good tap but dont beat the hell out of it,then find a reference point on the slide and sight and make 100% sure its even on both sides.I have used locktite on some and not on others never had a problem iether way so your choice.especially on a glock if someone at a shop wants to be a douchbag walk away,do it yourself and like the previous poster said look on you tube alot of selfhelp for everything you could ever want to know about glock.SingleStack i hope this helps you good luck :up: