I would suggest finding some distractions first before going to the interview. You can either go to a Grocery Store or ATM. And do the breathing exercises. You can try the following exercise half an hour before the interview: 1: Inhale slowly with you nose - make sure you do diaphragm breathing. 2: Hold the breath for 5 Seconds 3: Exhale like they do in Colgate toothpaste ad. Exhale hardly and exhale for 5 seconds Alongside, try speaking before the mirror about how you are feeling for the interview. Make sure you utter 3 words and then take a breath slowly then keep on doing this. I would suggest doing it for 10 minutes atleast and keep the eye contact while speaking before the mirror. These will for sure help you keep your fluency better. I would suggest not sharing your Stutter with HR. If he figures that out, it's upto him. I did once talked about my Stutter in an interview and right after that I stuttered more and felt low. You're gonna rock it! Good luck!