For most people, the interview is like crossing the ocean. By nature a nervous feel would be a hurdle to perform best in interview, though a person is strong enough in the skill. To overcome the nervous feel, rehearsal in front of a mirror or taking your friend's help to create a field of interview would give you some confidence. Put your efforts to know all the features or have deep knowledge in your skill. Few simple tips are listed here that helped me personally when appeared for interviews and now being an interviewer, I observe and expect the respondent to produce a good impression along with technical skills.
First thing, prepare yourself better to explain about yourself(yes, introduce yourself). Though a respondent is a genius in his skills, face difficult to answer a simple and first question to introduce himself/herself. It's better to use simple English with brief sentences(should not exceed 60 seconds) than an elaborate one. Your introduction should give the interviewer know where your career began and why you are there for an interview. For example: Hi, I'm Ganesh, I did my graduation in Anna University, Chennai. Started my career with Wipro Technologies in Selenium testing and served my tenure with good learning. Switched to Infosys Technology solutions by looking for challenging roles in career. Being a good team player I attained advanced knowledge and now I'm expecting a still better role to prove my skills.
Secondly, dig about possible questions from your domain and prepare yourself to answer. Though you cannot expect the same questions, It may help you to appear in the interview with confidence. Be updated and know the competitor in your domain or application.
Third thing, choose your formal dress and make you look cool if you are confident with above preparation. Do not use strong odor perfumes.
Fourth, carry required documents as mentioned in the call letter. Keep your mobile in silent/flight mode prior entering the panel. Once entered, take your time to sit in your comfort and start your conversation with Hi/Hello to let your interviewer know that you are cool and ready to start.
Fifth, be precise in your communication and avoid unnecessary fillers. Listen the question carefully and if required you can request to repeat the query and be cautious to respond the technical questions. Never admit yourself that you are great in unknown topics as it may be embarrassing if you are questioned from that topic. Also, never say that you don't know something rather you can say that you haven't got a chance to work on that topic and you would be able to provide your best to learn it in the future.
Sixth, you will be given a chance to ask about the role that you are being interviewed for. You can ask brief details about the role. For example, working hours, team size, etc. Never ask for feedback with the panelist at the end. Feedback about your interview will be informed by HR or Consultancy as per the selection process.
Seventh, rate yourself with your performance level if required in each interview. Check the topics that are asked and make a note of it, it may help for the next round or interview with another company.
I hope it would be helpful for Freshers and for those who are switching from one company to another first time.