SO my car broke down last week and I had to take it to the mechanic, Have you ever used a mechanic? 
luckily my father in law is a mechanic so we take our car to him whenever it needs something. what was wrong wit your car? The main point of being a mechanic is to diagnose, evaluate and fix it quicky.
I agree fixing cars is a good thing to know how to do, It saves you tons of money. 
As long as you know some basic maintenance, which is a fundamental part of their job in todays modern world.
Yes I agree, Being a mechanic pays well at around $27 an hour and government mechanics get paid even more. 
MEchanics can specialize in a specific type of car
Yes Ive seen many places that specialize in tires and others that just do mufflers. 
They also work on preventative maintenace