Desire. And a healthy dose of masochism. Frankly, there is no foolproof way to prepare for this position - you just need to be good at finding and keeping track of information, and willing to roll over and do whatever someone tells you to. You may be working a lot on a computer, so computer skills - or even a computer degree - could come very much in handy. You should be a social creature, as you will have to communicate with a diverse (and mostly tough to deal with) array of individuals, and flexibility is a must. You will constantly be moving, and all of your own concerns, relationships, interests and hobbies are secondary, if not inconsequential (to your boss, anyway). You have to really want to be involved with the movie business. Then, after you’ve gotten the fairy tale beaten out of you, you can move on and do something more substantive and rewarding with your life.