my hair is short. my father is dead.
in America we usually call them mechanics. You seem to know a lot about them, would you tell me more Oh yea!, well what they basically do is to  diagnose the problem accurately and quickly.
Oh I understand that. I work on cars for a living so I can relate. 
i wish i was good at mechanics , those bills are high !
i wish i was good at mechanics , those bills are high !
I do as well, but the mechanic has the advantage.
Oh well my Their job usually involves the repair of a specific part or the replacement of one or more car parts usually.