I think I may the only peron here who likes job interviews. You get a certain level of adrenaline from a stressful moment. The keys for me are
1. go to as many as possible to get used to answering questions
2. have stories about past work experiences prepared so that you can answer a question with a story instead of a hypothetical. If you don't have a good story for a question make one up.
This demonstrates your past experience better than a couple of lines on a resume. (I think that this is most important and most neglected)
3. have intelligent questions prepared for the interviewer. This shows that you can think on your own and understand what is important to the interviewer.
4. if at all possible solve a problem or show how you can solve a problem for the interviewer. In the job interview for my current employer they showed me an excel sheet that they used frequently. They told me how an error would occassionally pop up. I showed them how to fix the error. It doesn't have to be an immmediate fix like this. Just show them how your skills fits their needs.
5. express interest in the job. This is obvious but I have interviewed several people that just didn't seem to want the job. This tells me that even if I offered it and they accepted they wouldn't be a good preformer.
An interview is like a sales interaction. You ask questions, find problems, solve problems.
I have been offer the job in 80+% of the time I have interviewed for a job and every time I really wanted the position. Of course I am young (27). The hard part for me is getting the interview. Especially at my last employer where 80 people would apply for one job and they would interview 8.
Thankfully that is all behind me.