I do most all mechanics myself, including truing wheels, replacing bottom bracket bearings, cassettes, chains, disc rotors and pads, tires and tubes and cables, saddles, cranks, chain-rings, pedals, brifters, and derailleurs. Do all normal maintenance such as lubing, flat repair, bar tape replacement. Only things I don't do are wheel builds, wheel hub maintenance and freehub maintenance, though I will do the latter soon I think. I also haven't bled my hydraulic brakes yet, that is coming up soon.
Worst in committing is I had to repair a recurring flat in my office at work. It was a flap in the tire from a small puncture that would rub the tube and create a hole in it. Once I figured that out it was a matter of placing a patch on the inside of the tire.