As long as you let each color dry long enough I think you will be fine to paint it yourself. Start with the lightest color first so that the next color covers any overspray. Paint the area where the lightest color will be , then wait about a week or so. Then mask off the painted area wherever you want that color to stop. Next paint your darker color, wait, and mask again. Then finish with the darkest color. I loved Christine as well, and Keith Gordon was a great actor that never quite took off. He was in a movie titled STATIC that is one of my favorites. If you have a salvage yard nearby, you might find some very interesting little parts that will make great accents and really set the bike off while possibly connecting it more to the automotive theme. Maybe trim some old sheet metal and make some fender skirts or something. Looking forward to seeing your next steps.