Don't forget about the prostate exam.
Seriously, put away all the guns, det cord, etc., dress "business like" and make a point of taking lots of notes. The agents are usually helpful and informative and it never hurts to be on good terms with the local field office. Ask for a business card and an email address from the agent in case you have questions later on. Takes about 2 hours. Keep in mind that if you've gotten to the point of the on-site visit, they allready know everything about you so no fibbing.
Good luck and be sure to post how it went.