Not every officer will welcome any instructions / asks from you.
Nobody rushes you, you can take time answering questions without giving any explanation. You can and should speak calmly at the interview, but loud and clear enough that officer can understand you.
Practice answers with somebody. Let them ask you all 100 questions and questions from your N-400 and give them answers. The more you practice, the more confident you'll feel.
Take a lawyer to interview with you if this makes you feel less stressed.
Good luck!