This was my first serious interview ever. I was nervous when I got to Amazon. However, everyone that works there were very nice. I had 4 one on one interview within almost 3 hrs of time. They were seriously one after another with no break. Before you finish with the first one, the second will be waiting for you outside already. One of my advice is to ask to take a break. Go to the bathroom and refresh yourself in between. Overall, the interview process was good, but timing was very tight. Be sure to review your accounting/finance stuff, they sure ask a lot about it.