Originally Posted by smd4

Of course, people should know their limitations. I can replace a light switch, but after doing that, and the light still doesn't come on, I call an electrician. Same for A/C or furnace problems. Or plumbing issues beyond cleaning a trap.

To me, aligning a derailleur hanger might be one of the simpler repairs. But if it's outside your wheelhouse, spend the $25 bucks and have it done by a shop.