When you get to an interview, you should be 100 percent ready for it, physically and mentally. Do your homework the night before and have all of the company information in the forefront of your mind. Reread your resume or CV until you can practically recite it from memory. Know how you’ll respond to the typical interview questions. Get plenty of rest. When you are this ready, you can walk in confident and relaxed.
If you are fidgeting and shuffling through papers in a waiting area, your nervousness will be noticed. Some hiring managers ask their receptionists how you seemed while waiting. Your calm and confidence will make a good first impression.