If you still want to have it done by someone else, I would highly reccomend Galati's Foreign Car Service at 27539 Lorain Road (Just west of Great Northern Mall)440-777-7764. I had them put Bilsteins shocks and struts on my 1999 S70 T5. It is a family run business. The owner drives S4s for Team Audi on the Speedvision circuit. I learned of them through the TireRack (Many good postings from happy customers). They will take delivery and install tires from the TireRack. They gave me a 25 year old Chevy to use as a loaner while they did my work. The loaner was clean and ran like new.

If you can change the brake pads successfully, you can change the rotors. No great mechanical skill is involved.

As you learned when you changed the front pads, you need a 7mm hex socket to remove the front caliper from each side. Suspend the caliper so it doesn't strain the brake line.

Remove the little indexing pin from the rotor with a 10mm wrench. You might need to tap the rotor with something heavy to break it loose, but it should come off without serious effort.

Take your replacement rotor (do NOT get anything made in China - their cast iron is of generally poor quality, warps easily, and by the way the US dept of commerce has lawsuits pending against the ChiComms charging illegal dumping of cast iron goods) and wipe it down with a rag wetted with paint thinner or similar solvent, just to remove any protective coating. Replacement is simple, just the reverse of removal. Unless your pads are relatively new (and it sounds like they are), put in new pads with the backing smeared with silicone brake grease to inhibit squeal, bolt up the caliper and that's it. Done.

Rears are about 2% more complicated because the caliper comes off differently, but it's still a 2-bolt arrangement (13mm if memory serves me well), then the caliper comes off after unbolting the indexing pin.