Do you ever start to tell someone a story and realize that your giving way too much back information? I have a tendency to do exactly that.
When promoting yourself its important to be concise. In today's world people are impatient (especially the media), so it's a good idea to get your point across quickly. You may want to try writing down your pitch or your description of your work and editing it down and then rehearsing it a bit. Of course, you don't want to sound like a robot so don't over polish it, but instead practice getting your main point across. Your goal is to be quick, clear and interesting.