A screenwriter friend of mine said your number one goal is to get to the end. So write it fast; don’t look back. If you have to have characters yak about something and you don’t have a solution, do it anyway and let it suck. Then go back over it in a couple of weeks, and you’ll be much clearer on what’s strong and what’s not strong and then attack the ones that are too verbose. At least you’ll have a laundry list of things the audience needs to know—but don’t hang up on finding the visual solution and not move forward on your screenplay.