I have worked as an automotive mechanic and I can tell you that I have become quite disillusioned with the whole idea. In theory this sounds like a great job, but in my experience at least, reality is that it's all about speed, knocking out job after job with no concern for doing it right or attention to detail. The "fast" technicians who knock out job after job without a care in the world, screwing everything up and getting multiple "comebacks" get congratulated by management for their "efficiency" and "sales volume" (numbers on paper), while the good technicians (of which there were FEW where I worked) who do an awesome job and make sure everything is just right (example, lug nuts set to proper torque, correct oil viscosity used, etc.) are told that they need to be faster and have their hours cut... Maybe it's just the company I worked for but I got the feeling that a lot of places, if not all, are like that at least to some degree. Unfortunately I think that many of the people who take their vehicles to a shop for service, do so because it isn't that important to them. So there is, sadly, something to be said for the "just get it done" philosophy. Not my cup of tea. I'm incapable of doing something with less than 100 percent effort. I can't bring myself to "half-ass it" and cut corners just to finish a job quickly and make more money. Those are the people who "do well" in this field. And even then, there's not a lot of money to be made, because there are so many people willing to do it. Sorry to tell it to you like this. I was once in your shoes, asking about these things on forums and thinking excitedly about the great possibilities... Good luck if you do decide to try it.