I just picked up a used G36 Saturday. Sunday I ordered a Crossbreed Supertuck, extended slide release, Pearce +0 mag extension, XS Big Dot 24/7 Express sights and a tactical grip glove by Pachmayr. Can I install the sights and the slide release myself or should I let a professional do it? Also, I couldn't find a grip glove labeled for the G36 so I guessed and ordered on the fits 19,23,25,32,38. Will it actually fit my Glock?