Joe,

It's not hard.

Done it lots of time with long lasting and beautiful results.

Use decent quality spray paint if you just want to color an area or whole blank. An airbrush can give you some amazing results if you are good with one.

Use light multiple coats until you get the depth of color you want. Avoid runs/sags.

Cover with a nice clear coat that won't react with your spray if you want to get the best and longest lasting results. I prefer urethanes for this, but test for compatibility first.

Good Luck!

Buddy