How do you know the parking brake pads are worn? Did you measure them? It is not like you use them to stop the car...do you? You only use them to hold the car once stopped. Maybe you just need to adjust your parking brake at the cable junction under the car??????
If they do need replacing, they`re not that difficult to do. Follow the manual.
When you bleed the brakes, most mechanics recommend pressure bleeders. I did mine the old way, by pumping.
****Make sure the master cylinder reservoir is filled completely. There are two chambers to it. I couldn`t get my rears to flow/bleed fluid until I shook it to get the second chamber to fill***