Im going to play devils advocate here and suggest avoiding EC and all HR prep. Don't go into that interview having molded yourself into an EC poster child. Having recently interviewed I was surprised by the nature of the panel interview. First thing they said was to be yourself and throw all that EC stuff out the window. It was an enjoyable conversation. These interviewers are getting tired of canned responses and the same stories garnered from a HR prep service. If you have some stories from your career and are a decent speaker you'd do just fine.