It can be very daunting, preparing for a job interview. You have already made a couple of large steps to get to this point. In fact you have made the biggest jump to change your job and then got accepted for an interview. You may have to have lots of answers prepared beforehand. Especially if they are questions on yourself. Sometimes I find those the hardest. Talking about yourself in the spotlight in front of people who have the power to decide your fate is one of the toughest things. But preparing is key.