I think there are some pics around, but from memory:
[] Remove the rear caliper
[] Remove the gigantic bolt (through the center of the wheel)
[] Slide the entire wheel/tire/rotor assembly to the right, out of the gear meshing.
Obviously you'll want to have the bike lifted. Its surprisingly easy once you jump into it. I think there is a large spacer on one side of the wheel, so be mindful of where that goes. I don't recall if it is symmetrical or not, so be careful with orientation. Otherwise, just start pulling the parts and you'll be square in no time.
-GL