A company will often interview applicants back-to-back. Each interview may be allotted a certain amount of time, perhaps 45 minutes. To make the best use of that time, you will need to be prepared, and, be respectful of their time. That means, arrive a few minutes early. Be polite. Smile. Make eye contact. Shake hands. Try to not be nervous. You need to come across as honest and sincere, and interested. So try to be your genuine self. However, don't be overly talkative. Listen to the question being asked, quickly formulate your answer, and start talking. But, don't go with one-word answers either! For example: If they ask if you have reliable transportation, don't just say "yes." You could say something like, "yes, I have my own car, which I take good care of. But, should something happen, I have a neighbor who is home during the day, and he has offered to let me take his car or give me a ride." This answer shows that you have recognized there will sometimes be problems, and you have a backup plan in place. It is much stronger than simply a Yes!
The more interviews you do, the easier this will become!