Reddit, I'm going for an interview today at 2PM, for a job that could set me for the rest of my life. Could you guys give me some advice?

A few months ago, I put in an application at an IT company, as a DBA. This initial position is only a stepping stone, or so I have been told. Today at 2 PM (USA Eastern), I'll be going for an interview with SIX people, all of whom will rip me to shreds about my knowledge and understanding of computers, and my work ethic, etc. I'm scared to death, that I might mess up, and I won't get the position. I'm a 21 year old, fresh out of college, and this could mean the beginning of a successful career. I was only told a few hours ago that there would be so many people, and it threw me off. Is there any advice that you guys could offer me, beyond the usual interview stuff?