Good research can help you decide what company or group is a good match for you. Use a video recorder to tape a mock interview. Role-play with a friend who knows something about interviewing. Think of how you look to the person on the other side of the table. Look for style changes that will enhance your interviewing skills.
Small changes can make a big difference.
The most important decision I make about a candidate takes place in the first three minutes of the interview. First impressions count. Think about how you react to someone when you meet him or her for the first time. As you can see, you don't have that much time to make a good or bad impression. Interview preparation can make the difference.