Another bit of advice from experience: If there is any way you can get access to a paint booth, do it. Unless you are in an environment where you can see the reflections off your work you are bound to get uneven coverage. You have to be able to SEE your paint surface before you can determine if you have a smooth even coat.
At least try to have access to see the way a paint booth is lit and duplicate the light placement where you intend to paint.
PS. There is no way I'd ever attempt a metallic job for my first paint job. All the problems you can have with a basic color is multiplied many times when shooting metallics.
