Job interviews are always stressful. You may think you are an experienced interviewer, but it is a good idea to brush up on your skills and take some time to practice interviewing. Best way to reduce the stress is to be prepared. Take the time to review common interview questions you will most likely be asked.
Take the time to research the company. You will then be ready with knowledgeable answers for the job interview questions that specifically relate to the company you are interviewing with. Practicing the interview with a friend or family member ahead of time makes it much easier when you're actually in a job interview.