Feeling nervous before an interview is completely normal, even for experienced people, and a little nervousness can actually sharpen you. The goal is not to eliminate nerves but to manage them so they do not take over. Most interview anxiety comes from feeling unprepared and from fear of the unknown, so tackling both is what steadies you.
Preparation is your best cure for nerves. Research the role and the organisation, know your own resume well enough to speak about anything on it, and prepare answers to common questions like tell me about yourself, your strengths, and why you want this. Practise out loud, ideally with someone else or in front of a mirror, because rehearsing turns scary blank moments into familiar ground. When you know your material, confidence rises naturally and the fear of the unknown shrinks.
On the day, manage the physical side of nerves. Arrive early so you are not rushing, take slow deep breaths before you go in, since slow breathing genuinely calms your body, and remind yourself that the interviewer wants you to do well, they are not your enemy. During the interview, it is fine to pause and think before answering rather than blurting, and if your mind goes blank, take a breath and it usually comes back. Speak at a steady pace, and remember that one shaky moment does not ruin everything. Treat each interview as practice too, because the more you do, the less frightening they become.
Example: Practising your answer to tell me about yourself out loud several times beforehand means that when the interview starts with it, you begin on solid, familiar ground and your nerves settle quickly.
One practical tip: Prepare thoroughly and breathe slowly before you go in. Preparation removes most of the fear, and slow breathing calms the physical nerves that remain.