Can't help with north Knoxville. Can with south Knoxville at Colonial Village on Chapman Highway. DIYKnox has opened at the old gas station/repair shop. They rent stalls/lifts at low costs by the hour and can have parts waiting for you at the lower commercial price if you know what you need. They have a certified tech working there nearly everyday that can help with normal repairs at no extra charge. They help you look up the repair you want to make online and guide you with how to do it. The techs are either retired from a local dealership or are working a second job. Good folks, opened up a couple of months ago.
They've had people coming in from Asheville to Roane County coming in. They are doing a lot with the car clubs around town. If you can get it there, it will cut your costs.