You might as well get ready to do the work you'll have to do daily if you win the job. Introduce yourself to the interviewer before you meet, in a phone call, or through a referral made by someone who knows you both. If you have to, spend some serious time finding someone who will do this for you. Don't consider this a minor option. Don't go on a blind date.
Companies retain headhunters because they hate blind dates.
Be tentative and you'll die. Don't wait to be asked to participate in the manager's work. You'll never be asked. Be on the job when you walk into your meeting. Arrive to face the manager's challenges with him.