WyWe at 2013-04-16 18:55:35:
First of all, watch this: http://www.youtube.com/watch?v=zGt3-fxOvug
Distractions and interruptions are hard to avoid sometimes. In my opinion reading material on screenwriting/writing is one of the biggest distractions because you are suddenly bombarded with rules and information you want to keep up with.
Screenwriting should be thought of as storytelling at first, not how well it is written or structured. That way you're focused on the story, scenes, and characters you want to develop. After you have a draft, I would read several screenplays to get a sense of some of the technicalities and structure.
Also, continually reading material on screenwriting can lead you to get caught up in someone else's success. It might be motivating, but it is more gratifying when you have written something and THEN go back to verify that you have followed a similar procedure. Their advice falls into place and makes more sense afterwards.
When I wrote my first screenplay I was under a time constraint. At first it was a little hard to get into and write, but the more you focus and become familiar with your characters, scenes and dialogue come easier.
Just remember, don't focus too much on the word, rather than your envision that is your story.