Interviewing does not have to be an intimidating experience. Certainly there may some excitement about the prospect of landing a great new job. But in the end, if you are the right fit for the job, the pieces will fall into place.
There are many good interviewers representing companies out there. And, there are many who are not so good. Keeping in mind that the goal of an interview is to executing a comprehensive review of all relevant facts about the candidate, you would be surprised how many interviewers miss the mark.