If you googlle search it you can get some good videos and manuals for free. I am a qualified mechanic and do my own maintenance even though I havent picked up the tools in anger for 8 years.
If Im looking for how to's on bike maintenance, i hit the www.parktool.com website. There is a repair section where you just choose the area on the bike you want to work on and its all there for you. Otherwise like Blinkybaz said, there are tons of youtube vids on bike repair where you can actually watch them do it (makes it a whole lot easier than using a manual). Hope this helps!
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http://www.amazon.co.uk/Big-Blue-Book-Cycle-Repairs/dp/B001EMZDOG/ref=sr_1_1?ie=UTF8&s=sports&qid=1235566732&sr=8-1