2. Not knowing yourself

To be an effective interviewee, you must be able to articulate in a clear, concise, and natural manner what you do – and how well you do it.

Make sure you know what sets you apart from other candidates and be specific about what you've done that has made you, your department, and former company successful.

Also, know your background without having to refer to your resume. There is no one better than you to tell your story.