Modern and Chanda are the two best 4x4 shops in town. I do agree however that fluid changes can be done in the garage at home. There are lots of guys on here who will help you turn your first few bolts, and then stand back and watch you learn. The nice part of learning your rig is if you run into problems on the trail, you will know what tools to have on hand and get yourself out of a bind.
As for Royal Purple, it's a great product if you tow or generate heat in other ways. For a daily driver and occasional wheeler, I have found Mobil 1 or Castrol to be great. In the end, it's like Coke or Pepsi, all in your taste.
Let me know if you'd like a hand changing some fluids.