Brake pads change with 2 left thumbs ???

Hello, dear people!

With my V8 I live like in a real relationship: every day a new adventure !
Now that he runs like clockwork after various self-mach repairs, he probably doesn't want to stop at all.
Since today I have the beautiful sound of metal on metal from the rear right brake...
Hope I can still save the disk when I'm fast.
I don't really want to invest so much, but rather convert it to a more powerful brake in spring, because I'm not quite happy with the original brake.
Especially at high speeds, pedal pressure and braking distance are not the yellow of the egg.
But back to the topic: as I had already posted, I am unfortunately not a screwdriver, was already proud of me that I found and cleaned the idle control...
Now the changing of the surface was already more often in the forum but still I have a few questions:
1. Can I safely take accessory coverings (have here for example car parts Unger directly opposite) ?
What do I have to do about. plan for it ?
2. The front change seems to be quite simple, but what does it look like in the back? Can I do this without special tools or is it more advisable for me to leave it to the professionals in the workshop?
And what does it cost me all the fun (at the front I would do myself, so only behind, coverings plus mounting fee) ?
And if I can also do it at the back, HOW do I have to do it, so what is to be considered and what tool do I need ??

Thank you from the bottom of my heart !!

Happy greeting from Bremen and all the best,
Michael