I do all of my work, unless it's a warranty item. Never had any service done without at least one screwup. Like, bolts hanging out a half inch on the front brake calipers when I was supposed to be riding off on the bike. Fred's videos and a service manual will help, if you know enough to use the right tools and you don't hamfist and you don't let your friends come over and "help", especially the big guy that drinks a lot.