This is just my own methodology, but I ask the local police / sheriff who the most reliable mechanic is. I then validate the number of tattoos on their team members. They must have a lot of tattoos and they have to be grumpy and their shop must be in a state of disarray. If they meet my criteria, then I have them do the work I can not do myself. This usually works out to be much less costly than working with a car dealership.

This is just my own unorthodox methodology. Your mileage may vary.