Before I had a 12 inches to the foot car, I had a 1:10 scale nitromethanol powered radio controlled monster truck. People joke about FIAT meaning 'Fix It Again Tomorrow' but this toy was off the scale for the number of repairs required. Being a 2-stroke engine, it had a clutch, a gearbox, transmission, diffs etc..., so it was not too dissimilar to a full-size car. I gained confidence fixing the toy, and then transferred that confidence to fixing my real car.
My first real car was a Fiat Uno, and that needed quite a bit doing to it. However, it was falling apart, and one day I permanently fixed it; I went out and bought a mk1 Punto! The Punto is one of my top 5 purchases ever made in life, and probably will be for the rest of my life. I do not count the Uno as a waste of time though since skills I learned fixing it were transferrable to the Punto.
Top tip if you need to replace something but don't know how to, go and get the part from a breakers' yard. That way, you not only get the part cheaply, but you learn how it fits by taking it off.