I think structure and pace would have to be two main concerns for new writers. If you find yourself with a scene of more than six pages you better be damn sure that the preceding scene has a great lead in to it and that it leads into the following scene with a bang. There will be exceptions, of course, when exposition simply must be inserted, but the rule generally holds. I have no hesitation in placing a scene where it will aid or even eliminate the need for exposition in dialogue. The characters' actions should show a great deal, rather than conveying the information through speaking.
Hero orders a certain very heavy drink at a bar.
This could show that he's had a bad day, that he's in despair, rather than him telling another character that he's feeling bad. If the magazine is a publication about guns and the hero mentions something about cheating wives, we may assume that he could be planning to kill his wife. You immediately, without formal exposition, get a large chunk of information about the hero. That's a marvelous screenplay that exhibits a remarkable economy in dialogue. You're known for your rich, authentic characters.