Quick question. Just got lucky enough to pick up a match trigger kit to drop into my .45 USP. I would like to do this install myself, however, I can't help but be a little worried. From what I've read, this doesn't sound too difficult. I live in WA and don't want to have to ship my gun out. It's my Duty carry firearm. Exactly how hard is this thing to install? Also, would installing it myself void the warranty on my USP?! Thanks for the help!