Indeed, any interview would be stressing enough to make you doubt about yourself. However, the pressure is not only for you, it is also for the interviewer because you both must guarantee “the new-perfect employer”.
Job interviews typically include many types of questions; hence your security and study of most possible themes with increase your own confidence. Despite it is not so common; some interviewer’s questions are about how to negotiate salaries.
Of course it is obvious when the applicants have taken the time to prepare for an interview; but it is even more when they have not. Consequently, there are many facts in which you must be better prepared trying always to impress the employer, presenting your skills and qualifications, and demonstrating your knowledge of the company.
“The more you practice, the more prepared you will be”