Reviewing others comments and not listening, I recommend to clients they practice for interviews 20x longer than the expected real session. You must be able to

Reviewing others comments and not listening, I recommend to clients they practice for interviews 20x longer than the expected real session. You must be able to field the hard questions about your background, critical thinking and abstract ideas in a polished manner. It is like acting but you are playing yourself. Nothing but practice, practice, practice with someone who has your best interests in mind, and won't let you avoid the tough questions, will do.