I have enjoyed reading SoulCinema's posts! I would add, coffee. Lot's of coffee. People have to have their caffeine drug to get going or keep going. The more coffee you have on a set, the easier the the cast and crew are to work with. They may be jittery from too much coffee but at least they are happy. Also, learn how to use a camera, well. On my first film, the camera guy cancelled after the cast had arrived! I read the manual and talked to another camera guy in tokyo while I was actually making the movie! Talk about tense! Now I wouldn't let another cameraman near the main camera! I know my cameras and how I want the scene to look and if I shoot the scene, watching the dailies is more a matter of looking for something out of frame that i didn't notice or looking for technical problems than deciding which takes to use because I saw the best take through the lens and know which one it was!