I can easily see how you get burned out, when I worked in an automotive repair shop for a living, the last thing I wanted to do on my own time was work on my own car, or someone else's.
My son is a full-time mechanic and believe me I recommend not buying a car from him lol... as a matter of fact I wouldn't never buy a car from a mechanic.... The last thing they want to do when they get home is work on their car...
