Like Squirtz said, there was a time doing all sorts of work on your car was pretty easy. You could open the hood and see everything, and sometimes even have room to climb in and do the work. A basic set of mechanic's tools did everything you needed to do. Heck, you could even reach up behind the dashboard to do work there. Then, one day I opened the hood on my new car and had no idea what I was looking at.