As someone who used to fix computers part-time but stopped advertising his services over six years ago, I can attest to the veracity of this “guide to being the local PC repair dude.” Specifically:
Expect to be riddled with calls and requests for fixing computers for the rest of your natural life.
I can sympathize. My job description might as well have “IT Lackey” tacked on.
Also, you might find this amusing:
http://xkcd.com/627/