I would advise that before you change the pads, you should decide whether you may need new rotors. Specs in the manual. Rotors are cheap. Buy good ones, Dealer, Balo, Ate. Do not buy cheapo Chinese rotors. If you do rotors and pads on the rear, you are probably good for many many miles, maybe the remaining life of the car.

Buy good pads, Dealer, Textar, Pagid, Jurid. Use the MB brake paste lightly on back and sides of pad (only on the metal surface, not the pad itself).

Another tip is to put a piece of tubing on the bleeder nipple. Crack the bleeder slightly before you press the piston back in the bore. That way the fluid doesn't get forced up the line. Tighten up once piston is back.

I don't know whether your car has break wear sensors in the rear. If it does, you should pay attention to their orientation. Other than that it's hard to put the parts back together incorrectly.

A very handy tool is a large pair of slip joint pliers. These can be used with a shop rag to squeeze the piston back. Having the proper brake pin punch is also very helpful. Finally, you need a small brass or stainless brush to clean up the caliper where the pad slides.

Good luck,

Steve