The thing with bicycle repair is that it takes a lot of practice, and if you only have 1 or 2 bikes, you don't get that practice like the techs at your LBS. I know I can do it, but I may not get it right the first time, or maybe the 2nd or 3rd time either. That's why I tend to take my bike to the shop for certain things that way there I can HTFU and ride. For instance, the last time I tweaked any of my drive train, I put 7 miles on the bike riding up and down the 1/8th mile street testing out my changes. In the end, I took it to the shop, the tech turned 2 screws, and wallah, it was perfect. Over time you will start to pick things up. I have only been back on a bike for the greater part of 2 years, and finally this year I started to learn some little things, though not enough to be all that competent yet. Patience young grasshopper