As previously mentioned, Cage's Book "Checklist..." is a good thing to invest in. What I found most valuable were the exercises in the book that had you recall certain flights/events in your history that had some significance to you. At first, it seemed difficult to recall more than a couple of flights that were memorable, but over a week or two, you can recall quite a few events. During the interview, those specific flights can be used for the "tell me about a time you... " portion. Best advice, be genuine and truthful.