Good luck Richard, but a warning ... once you've tasted a Mac you might never want anything else.
I've not got one of these models but all the others I've worked on have been very easily servicable. The Mac web site has been useful to me previously and you might like to look at a site called Low End Mac. They specialise in all manner of the slightly older and ancient models. Lots of technical info, photos and tech details, and a place to ask questions.
Good Luck, see you in October !
Bo