I find myself in a similar situation as an interview for a stock broker apprenticeship is scheduled for this Tuesday. But I have sent their recruitment assistant an email this evening asking for some more information on what the roles will be entailing. I did, however, add that if each position's criteria requires strong team-working skills, an outgoing nature and confidence dealing with people, then none would be suitable for me.
Incidentally, I have been unemployed for almost five years now and shamefully have NEVER had a successful interview with an employer. The only occasion on which I managed to find employment was through an employment agency, who were recruiting for a terribly desperate factory at the time.
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"Every day, once a day, give yourself a present. Don't plan it, don't wait for it, just let it happen. " - Special Agent Dale Cooper, Twin Peaks