Be honest, Look for areas where you can admit error and say so. Apologize for your mistakes. It will help disarm your opponents and reduce defensiveness.
Dale CarnegieDevelop success from failures. Discouragement and failure are two of the surest stepping stones to success. The successful man will profit from his mistakes and try again in a different way. When you're afraid, keep your mind on what you have to do...if you have been thoroughly prepared, you will not be afraid. We all have possibilities we don't know about. We can do things we don't even dream we can do.
Dale Carnegie