Obviously you are in good hands here with the advice you are getting. If I may - especially because it is a sales job - ask for the job at the end of the interview! It doesn't have to be as blunt as "do I get the job?", but show that you want it.
"I feel like I have a firm understanding of what it is your looking for, and I feel good about the opportunity. Do you see any reason why we can't move forward?"
As Mondak mentioned, they want to hire your professionalism and enthusiasm. You would be suprised at every level in a corporation how it seems to come down to that. Good Luck!
Oh, and Mephisto... most of us yanks use the term resume - unfortunately I fear not even many HR folks in USA would understand!