Actually, the best advice is the same as for an interview: Be yourself, unless your an asshole.  Then, be someone else.

Yea Christmas Eve was going to be my first time, I made all kinds of arrangements to get my room mate out of the house and everything. I called the girl I wanted, she said she would be there in 45 minutes, I wait, and wait and wait. She never shows, I tried to call a couple others but couldn't find any availabe that late and on Xmas eve.

I was so excited after talking to her, my heart was pounding out of my chest I was so excited and nervous. After three hours and about six beers of waiting I was just pissed and disappointed. I haven't tried again yet, I will surely pick someone with more positive reviews before I try it again.