Matt Shields at 2011-04-26 15:48:03:
First, I am not the Matt who asked this question but..
Thank you to he who did. It is also something I have struggled with over a couple scripts, even though I'd been given answers on how to do it. Like anything, it often takes many attempts to learn a new skill.
An approach that helps me now is on early drafts, if I'm unsure, I write a slug-line even if it seems superfluous. Later I dedicate a couple 'passes' just to slug-lines, tightening and eliminating whenever they jump out or stop the flow.