I just replaced all my pads and callipers for the first time.
On the rear calliper, just remove the lower bolt (has a boot) on the backside (12mm if memory serves).
Then just wiggle the calliper and it will release and then you can swing it up on the upper pin.
Once it has swung up and cleared the rotor, you slide it back off the upper pin (the other one with the boot). Then tie the calliper out of the way (cloths hanger to the coil works well)
Then remove the calliper bracket by removing the 2 mounting bolts on the backside (14mm if memory serves).
Pull the bracket off.
If you want to remove the rotor, you will have to release the parking brake (make sure your car is secured and cannot move with it released) because the parking brake is a drum brake pressing against the inside of the rotor.
To break the rotor away from the wheel hub, you have to find a couple of bolts that will fit those 2 threaded holes on the inside of the rotor. They have to be long enough to go through the rotor and push against the wheel hub as you tighten them. Or you can break them free by banging them off with a rubber mallet, but that is tricky with that brake shield in the way.
Here is a pic I took while doing the job.
