The Tricks to a Successful Interview

I feel like this activity taught me a great deal about interviews. I saw that every interview is different, because every person is different. It may be calm and easy to speak with the interviewer, or it could be awkward and very tense. The trick is to enter the interview with confidence having practiced, and knowing that you have the qualifications to be hired for the position. If you don't believe in yourself and your marketability, then neither will the interviewer.
I learned that I am very confident in my speaking and posture, like looking them in the eye for example. I am also very apt to thinking on the spot and letting my words flow fairly easy. The part that I struggle with is that I am a very high-energy person, and that tends to come out in stressful situations. I tend to move a lot, whether my hands or my legs, in an effort to get the 'jitters' out. I just need to find a way to relax and let my confidence take control, rather than my jitters.
The best advice I could give would be as I stated earlier-be confident. Practice and preparation breed confidence, and it is hard to fail when you are confident. Yes, the process will always be somewhat different and the results could have great impacts on one's life, but the basis of the interview is the same. If you have done your homework and built up your skills to a satisfactory degree, then you are qualified for any job you apply for. If you believe that, then it will be hard for the interviewer to leave thinking any different.