Oh, man. I never did it in middle school, even though my friends would probably say so (it's just unreliable propaganda that ruined relations between two people that I have to clean up. Even though I have been in this position, I was being approached and completely bombed it...thanks friends. I think this is where your knowledge comes in. Not all of them love nerds, but there at least have to some who do. Make sure your not only talking about your self, try to ask questions about her interests. Also answer her questions as best as you can. Try to take steady breaths and remain sane. And try to not be disappointed in any mistakes that you think you did, even though it might be funny to others, try to remember there could be worse mistakes that can happen that will give people nightmares. That's all the advice I have to offer, let me know if it sounds cliche, because I only slightly experienced that scenario.