Gosh, I was sooooo nervous. My first interview was at DMU, and I felt that I was a hot mess. It was an awesome school, but I felt pretty intimidated by the other applicants because they were all welcoming, interesting people, and I thought they all had higher stats than me. Thus when I went into my interview, I swear I could feel my face twitching! Also, I felt that in answering some questions, I would just say the first thing that popped into my head , and I would wince internally. To make matters worse, I had no concept of time while interviewing so I thought that my thirty-five minute interview was ten minutes. When my interviewers started to say, "I think we'll wrap this up..." I started to panic internally because I thought they already decided they didn't want me and were going to cut the interview short so that they could leave early! In fact, when they were answering my questions that I had about the program, I could hardly focus on what the interviewers were saying. Needless to say, I kept my cool even though I was screaming internally. Luckily, I think DMU liked me enough to accept me. 😀
So my advice is to NEVER let your inner turmoil cause you to backtrack verbally. I discovered after that interview that what I was feeling inside didn't affect my outward presence. Also understand that time goes a lot faster while you are interviewing, and everyone's given a pass for some weak answers. Lastly, never underestimate your own merits, and don't get discouraged by how awesome some of the other applicants appear to be. Having been through all that, I felt that my later interviews went a lot smoother for me- or at least, I didn't feel dejected and miserable afterward.