Take out your hardware. Take pictures of the interior and exterior. Remove all the plastic from the chassis, remove all screws and standoffs - if applicable.
-I suppose I should add that you can use masking tape to cover anything you don't want to paint-
-And when you go to reassemble, run the screws you took off and screw them in, then out, for every screw hole that got painted. Then vacuum up the little paint chips before putting the hardware back in-
Standard spray paint is fine. It will smell when it gets warmed up for a while.
If you are going for a fairly basic color, they make temperature rated paints for engine blocks.