Removing the parking brake after taking the wheel nut off helps hold the wheel to turn the nut.
Don't squeeze the brake lever when it is off. It is difficult to get the pads to open up all the way for putting back over the disk. (Maybe there is a trick too it but I struggled with this first time.)
As someone else said keep track of which bolts go where. Twice I have installed the wrong bolt then later ended up with one too short. Both some of the allen head and regular head are the same thread and can go in the wrong spot. This was my third time and each one gets easier and has saved about $40 in labor each time.
Rear brake disconnected, sliding off disk.
Close up of nut on rear wheel.
Brake removed, bolt out of bottom of rear shock.
Parking brake removed
Support bracket removed.
Rear tire off.