if the paint is still on it. then u need to get probably 300-400 grit sand paper and start sanding....then id probably go to 800.... primer...sand some more....general rule is to get anything shiny dull looking....

to tell u the truth its a lot better for the shop to prep the car for ya. some people that paint cars are ANAL about prepping...and ull probably just screw it up for them if ur asking on am msg. board. course thats just my opinion