Be confident in your abilities, but don't be a jerk about it.
"My thoughts drifted to past interviews. The time I made a joke about hair plugs to a man with hair plugs. My brief chat with the grisly manager of a motorcycle bar. The putty grin of a Cutco representative."
Unlike a lot of recent college grads who are job hunting right now, and sending out resumes and cover letters to what seems like an abyss, I was a fortunate young college graduate who was asked to go in and interview for many of the jobs I applied to. Coming out of college, I did not get most of the jobs I interviewed for, but I learned a lot about what employers look for during the interview process, and the main thing I learned was that everyone expects different things, so you have to be prepared for anything.