At my interview I was very relaxed considering that it was a group interview, and our interviewer was the only person to ask a technical question. He also asked some controversial questions about what is going on in the pharmacy industry (would you give a lethal dose of morphine to a terminally ill patient that wants to die, has all paperwork to give consent, but not in a state with the right to die law or would you just follow the orders of a doctor? or assuming it's against your religion, would you give the morning after pill to a young teenage girl?). I actually enjoyed talking the professor although I could see how others would find him intimidating. So at the end of the interview, I was very confident about getting in which I did. I think during an interview you can get a good feeling of how things are going--especially if you have been through several interviews. I would say not to analyze your interview too much--like taking tests, normally your first gut instinct is usually right. Good luck!