Have this stalled out project, sons '62 Fairlane Sports Coupe. we need to paint the interior and move forward. I have all the equipment, but my painting experience is limited to trailers and parts and whatever, not with automotive type paint. I have the paint and clear coat, but am not sure exactly how to prep it. The color is the original red color. what grit does it need to be sanded to? will I need primer, sealer or anything like that? I really need a step by step, tried searching but there is so much info out there and honestly its confusing. any advise will be appreciated, thanks!