There is the best advice right there. If you start bragging and BSing you will go down in flames. I have interviewed new teachers and you can sniff out a lie like a fart in a phone booth.
Be calm. Don't be afraid to take a moment to think about your answer. Here is a great stall tactic, "Wow that is a great question, give me a second to think that one over."
Tell the truth and be confident in your answers. Don't tell them what they want to hear. They want to hear what Ruth has to say.