you dont need to take off the rear wheel to get the brake pads out. you need to take pin out so brake pads are loose then you should be able to get one brake pad out by using a screw driver. undo the caliper so its off, then you shoudl be able to get the other one off by wiggling it about. then make sure the pistons inside the caliper are right in otherwise it wont work, put one brake pad in, put it back in place then slide the other brake pad in (may take a while cos its fiddly.
i have just done mine on the same model. cheers
gavin
August 2008