-Does it have drum or disc brakes on the rear?
Here is some information for you about the rear disc brake replacement
After replacing rear wheels make sure to pump brake pedal to ensure firm pedal before placing in gear
No the center 8 bolts just hold the axle in to the hub,you will need to get a long pry bar and get in behind the rim between the rim and brake disc and gently pry out,the wheel is rusted to the hub and needs to be broke loose,spraying a lube like WD40 around the inner part of the rim will help also. When you get the rims off there will be 2 16mm head bolts in the caliper that bolt to the caliper mount,remove these and then remove the caliper,replace the brake pads and slides provided in the new pad kit,then with a C-clampand an old pad push the pistons back into the the caliper to make clearance for the new pads,reinstall the caliper,install and tighten the bolts,repat for the other side.
After lugnuts are removed try hitting or kicking the tire to jar the wheel loose, do not pry on the rotor you may cause damage to the rotor.