I agree with Woody on what he says, like practice on something to see how the paint is laying down before going at your truck.
I also find its very helpful to provide enough light to see what your doing. Lights overhead do not always give you enough. I always put some light down low to reflect back and let me see how the paint is going on. I have lights mounted on the walls to help me see the sides of car or truck. It needs to go on wet, the hard part is seeing when its enough so curtains don't start showing up.
