I agree with Bob. Be clean, and be ready to paint! I always find that if I do the parts that are hardest to reach first, it makes the rest seem like a breeze. All the flat panels go pretty quickly anyway.
Airbrushes can also be a helpful tool as well. If you set the spray pattern as big as it will go, and use a the largest bottle that will fit it, you can get into a lot of inaccessable places like the bottom of the bed rails. The only downside, is that most of them have very small paint bottle on them.