That comes off as a bit of defeatist attitude. I've met people who don't know how to change their oil, and literally zero interest in learning. If you've ever used a screwdriver/socket, and know "lefty loosey, righty tighty", then you have the technical skill to change your oil. Oh and maybe knowing how to use a funnel helps too, although that's really just part of the "adding oil" skill.
Learning to change your own oil is one thing. The skill I was referring to was having a solid enough knowledge of cars and the used car market such that you can effectively mark your car purchase budget as 0. This is kind of like being an arbitrage trader in the world of cars.
Learning to change your oil is just the first step in a process to learn how to repair your own vehicles. Sort like putting on skates is the first step to learning how to figure skate.
