Im not downplaying your ambitions for a quality shop, but in all seriousness, you cant mess up installing brake pads.
You should go to a store and buy them yourself, and put them in, all you need is a socket set, a "C"-clamp and a way to lift your wheel off the ground.
-To replace them you simply unbolt the wheel, and unbolt the caliper
-Then you pop out the old pads, compress the piston with the clamp, and snap in the new ones
-Re-bolt the caliper
-Re-bolt the wheel
-Done
If you don't wanna do it yourself just go to any shop, they wont mess up, and if you have problems with your brakes afterward, it because your car is old not because they messed up, you CANNOT mess up.