There's another option too.

Pickup a couple of cheap and cheezy goodwill grade old bikes and fix them up using Sheldon's website and the Park Tools websites as online training material. This way you're not working on your commuter special that you rely on to get to work and run errands. That alone will take a lot of the stress off the learning thing.

From there I know that I have picked up a HUGE amount of information by just reading forums like this one and when I see something that doesn't sound familiar I then go google it and learn about it. Then when I run across the part or issue it's not a surprise.

But hands on with a little help in the background either with someone watching or asking about a confusing area on this forum and you'll be fine.