Yeah, getting the stock ones off can be a pain. Once you've done that you're home and dry. There are various techniques, some people take them both off in one go. I took the front one off first - takes a bit longer but is easier I reckon.
Best advice I have is make sure you have the right tools before you start. You're going to want a nice big breaker bar, and a good set of wobble bar extensions (Machine Mart do a great set pretty cheap), good set of sockets and do yourself a favour and get some of the ratchet spanners from Halfords. Can't remember the sizes you'll need now, but IIRC it's 10mm, 12mm, 13mm and 14mm. Oh, and get a set of torx spanners too, for undoing studs. Then just take your time.