The incompetence at Discount isn't with the sales guys. It's with the people that torque the lug nuts. I've made a point to talk to the guys doing my tires. I'll tell them the torque value, and they've never listened. They just grab an impact wrench and send it. That's the problem I've had at most of the auto shops that I've ever used. They do things fast, and they take shortcuts. That or they're just not very bright. I at least have some sympathy for those poor souls.
The last auto shop I used up in North Phoenix left a really bad taste in my mouth, and they were supposed to have a great reputation. I didn't even bring my car in. I just brought them my wheel hubs. I didn't have the right punch set, and I didn't want to booger up the hub knocking out the old bearing races with the wrong tools, so I left it to the professionals. At the same time, I asked them to remove the stubborn bolts holding on the brake rotors to the hub, and I supplied them with brand new brake rotors to install. For the first time in years, I trusted my old Mercedes with someone else on a simple straightforward job, and they still figured out how to mess it up.
They called me up to tell me that the races were out and that they removed the old rotors, but that the new rotors were the wrong size. I get down there and look at it on the bench with them. First of all, they scarred the hub up getting one of the bearing races out which is what I was hoping to avoid by taking it to them. Then, they showed me the brake rotors and how they didn't fit. Now, picture a brake rotor with 10 holes. That's two sets of 5 holes with different bolt patterns. They lined up the wrong set of bolt holes. I looked at it for one second, and then rotated the rotor one tenth of a rotation to align the right holes, and then I just stared at the mechanic while he scratched his head for a moment. All of that to say, I have big-time trust issues with mechanics.
I recently picked up a 100 series Land Cruiser and they tend to need mechanics that specialize in them since they're built so different than most other Toyotas. Hopefully, I can find a good shop and learn to let go.