I credit my dad for teaching me what I know. He was never the type to pay anyone to do anything. He did everything himself around the house.
My first few cars growing up were used and therefore always needed some type of work done. From when I was in my mid to late teens, I was doing everything from changing tires, replacing the alternator, doing tune-ups and even changing my oil. And just last week or so I rotated my own tires.
You never know what might happen late at night, on the highway, driving alone. You always have to be prepared!