Interviewing takes practice. No matter how trivial the job might seem, take the interview. This is a great opportunity to try new things such as time of day, day of the week, outfit, different questions for the interviewer, different responses from you, and if you’re interviewing online, testing different backgrounds and lighting. Just going through the practice will help you for the next one with improved muscle memory (your brain is a muscle of sorts,) honing your skills, and creating new habits. In no time, interviewing will be second nature. Or not - you might get the first job!