My hood has 11 of the 12 required holes for the ornamental louvers (no idea) and the car has already been painted so I get to drill a hole in painted metal. Placement shouldn't be an issue since I can line up the other 5 holes and mark where the 6 goes, but I'm very nervous about drilling that metal. Any pointers or tips? I saw a youtube video recommending to put down painter's tape to prevent damage to the paint. Anything else I should do? What kind of bit should I use?