One thing I've learned from this forum is 'never be afraid to try and fix something'. Yes, I often have to read up on what it is I'm going to do, but most everything has gone well. The few that haven't were corrected after a few more tries. Result; I know my ride and am a fair hand at dealing with all its systems and adjustments.
I just kept the worst case scenario in mind, which is taking it to the LBS after I had screwed everything up. Well, because bikes really are simple machines, I never had to do that. Learning more about your ride always pays off, in savings and satisfaction. bk