First of all, congratulations on the interview! Now I'm guessing yours will be a little different than mine, as I'm not in the US and had to do a phone interview. I actually would have preferred an in-person interview because I believe it's easier than a phone interview. But I must have done well enough because I will be at Goucher this upcoming spring.
I guess all I can recommend is to not worry too much. The questions are very straight-forward and they really just want to get to know you better, so don't expect any "curveball" questions. It was actually one of the easier interviews I've ever had because it was more personal. I think you should be fine.
Hope all goes well with the interview!