Interviews are a chance for you to put forth your narrative, to tell your story to the potential employers.  Its about where you're coming from, where you hope to go, what your goals are, what your skills are, and how all of that makes you a good candidate for the job they are trying to fill.

Spend some time learning about the company and about the job you're applying for.  The more informed you are, the easier it will be to handle interview questions and pitch your qualifications to the hiring manager.

Practice answering some interview questions, so you're comfortable responding to the most common questions employers ask.  This type of rehearsing will help you feel confident on the day of the interview. 

Think of yourself as the product, and be prepared to sell yourself. To do so effectively, you'll need to be able to share why you're qualified for the job. You'll also want to make it clear during the interview that you're interested in this specific job at this specific company — not just any job that's available, at any company.

Appearances and how you conduct yourself during the interview are important as well. If you come to an interview chewing gum or drinking coffee, you will already have one strike against you.  Too much perfume or not enough deodorant won't help either. Excessive make up, and loud 

accessories are probably best avoided.

While you may no get the chance to ask questions in all interviews, be prepared to respond when you're asked whether you have any questions.  You can ask about the job, the company, and about any details that you'd like to know more about.

Before you leave the interview, be sure to thank the interviewer for their time, and for considering you for the position.  Then follow up with an email message or thank-you letter that reiterates your interest in the position, and your thanks for being considered.