It reminds me of those first job interviews I used to go to - I was utterly clueless, and any mates I had were either all in the same boat as fresh graduates, or folk who ended up in jobs that never needed interview in the first place.
Looking back I wonder that I ever passed as fit for employment - ah, the carefree outlook / bravado / arrogance / rank stupidity of youth!
Best of luck with the interview :)