Practice, Practice, Practice. It will come. Work on parts that aren't needed for a restoration. This way if you mess up, it won't hurt anything. I'd suggest trying the roller method first, like shown in the video above. This will give you a good starting step, for feeling the smoothness of the paint, and for getting an idea as to how much paint needs to be applied. Once you have this mastered, then move onto spray cans, and then a spray gun if you so desire.
If you don't have extra parts laying around, practice on empty soup, coffee or vegetable cans. This especially works when you get to the spray can painting step. Everybody has empty cans in their recyclying bin, wheather it be your's or your neighbors.
Edited by johndeereelfman, August 25, 2012 - 06:43 PM.