The secret to behavioral interviewing is going into the interview with 5 - 7 great things you've accomplished in previous jobs, differences you've made. Then, no matter what they ask you can twist the answer around as you need to in order to get one of the 5 - 7 great things you've accomplished out for each question.
For example, a question may be, "tell me about a time you had a disagreement with a supervisor or employee" or "think of a good experience a customer had because you anticipated or met their needs" or "tell me about a time when you had to change your approach when dealing with others in order to get results".
Have some good examples in your head and you can talk and twist your way to a great interview.