My advise to you is to tell the interviewer about your stutter so you would feel more comfortable, they would understand and it would relive a lot of anxiety off your chest and lastly prepare and have notes to read and an general idea of topics to talk about when you reach those questions, prepare those answers so you can say it without too much thinking and lastly since you told the interviewer about your stutter don’t be shy to go though a stutter, it’s better to stutter then to avoid key words that they are looking for in the interview. I am speaking from experience, just had an interview today and I did what I’m telling you rn and I’m telling you I felt great and confident during it. You will always feel nervous beforehand and to counteract it a bit I take L-Tyrosine which is a natural amino acid supplement and is very safe, and that helps me to calm my nerves and there is some research to show it helps out when a person is feeling stressed and i usually feel it in the last 1-2 hours leading up to job interviews.