Have you seen this? It’s a mechanic who has a few dozen videos of most of the common bike adjustments that you would want to do at home. I’ve used it twice, and found it a BIG help. Even for stuff that I know how to do, it’s helpful to see someone else do it first.
Right now there are 34 videos, but there is also a section where folks can request new videos and vote on ones that have already been requested. This is already a fairly useful site, and soon it could be up to Sheldon Brown status!