Repair Manuals

I somehow managed to forget about mentioning this, most important of tools, the repair manual.

Any autoparts store will carry these and they exist for most cars out there. These are the Chilton brand of manuals sold at Oreilly's, but I personally like the ones made by Haynes more, I find it to be more detailed and easier to follow.

Here are some links so you can search to see if a manual exists for your car:
Chilton
Haynes