This is a very easy job - the longest part about it is jacking the car up and taking the wheels off! The pads are in a carrier held on to the caliper by two bolts on the back of the caliper. You'll need a couple of spanners (15 & 17 or 17 & 19mm, can't remember which) - one to hold the sliding sleeve and one to undo the bolt (it'll be clear when you see it!!) Once the two bolts are undone, remove the old pads, push the piston back in to the caliper (use a g-clamp), pop the new pads back in (with a bit of copper grease on the back to stop 'em squealing) and bolt everything back together. Should be no more than 10 mins a side, plus wheel removal / refitting. The pads have integral springs, so there's not even any fannying about with them.
Last time I changed mine, I used whatever the local motor factors sold me (Apec, I think), and they work fine. About £20 a set.
There's always one - and it's usually me!