Preparing for a Writers Conference

How like a job interview is pitching to an Editor or Agent?
Your resume may look as good as it's going to get, but is your synopsis or pitch ever good enough. I have about one month to polish and prune--that should do it, right? I used to think I could never be a screenwriter, because they have to go into the Producers board room and pitch their screenplay to all those glowering executives who are already calculating production dollar costs; whether your piece is paced right and etc.

Umm...it seems that we writers of novels basically have to sell our writing in the same way--if not face to face, as at a writers' conference, then in our Query letter and Synopsis.

The ideal pitch is my quest for now.