GO FOR IT!!!!!
BUT, absolutely! 100% use the cautions just mentioned.
1. set up a spray area with adequate ventilation. I built a spray booth in my basement complete with exhaust fan and intake and exhaust filters.
2. get the appropriate MASK...a must when spraying euro's. Urethane based paints is very popular today.
3. shop around for a small touch-up type gun. Inexpensive and easy to learn with as apposed to a full sized gun for doing cars/trucks. Bike parts are reasonably small and I have managed to do several paint jobs with my small touch up gun. Worth a try thats for sure.
4. I went to a local sheet metal shop or sign supply shop and purchased a 4x8 x .040 sheet of aluminum sign material, cut up into 8 2'x2' squares. The 4x8 sheet comes painted white on one side, black on the other. All ready to be scuffed and painted, primed, whatever you want to practice.
You can scuff, base, clear and strip them over and over....works great. This is the place to make your mistakes man....although I have made mistakes on my tins, and had to start them over again. Thats where things can get costly.
5. you can save money by purchasing inexpensive base paints for practice. But when it comes to finishing the job you'll want to be GOOD at laying down the clear. This step can make or break a paint job.
I'd say go for it but get set up properly before jumping right into the painting...set up a decent spray area with plenty of ventilation and reasonably dust free and wear that mask and have a blast!