Ok, my son has an 03 Neon SXT 4dr. It needs to have the drivers front door replaced. He hit a pole in a parking lot and crushed the door in beyond a bump out repair. I found a door off another 03 Neon in a junkyard. I done alot of work on cars, but I've never replaced a door before. When I remove the door, do I leave the old hinges on the body and unscrew the bolts to the door? Or do I leave the old hinges on the door and unscrew from the body?