Rear brakes replacement

Here is a site link that is a walk through of the procedure;
https://www.2carpros.com/articles/how-to-replace-rear-brake-pads-and-rotors

There are some variances, but it is a good example overall.
The only thing I can think of that you might run into is getting the piston to retract into the caliper so the new pads will have room to go on the rotor.
Rear calipers often have a large "Cross Cut" or "phillips Head" reccess in the piston. This can be truned to get the piston to move into the caliper. This is also how the parking brake gets engaged. So, it is best to have the parking brake dis-engaged.
Also, be careful and put a chock on both sides of the front wheels and use jack-stands when working under a vehicle at all times.
I will keep an eye on this post and will reply ASAP if you need anything else.