So I definitely stuttered during my interview for the job I have now. I had a hard block and could not get the word out but I quickly recovered and didn’t let it phase me. That would be my biggest tip, don’t let them see you sweat it and play it off. If you focus on it, they will too. I personally do not disclose my stutter before interviews because it’s pretty mild except for when I’m very uncomfortable. One way for me to loosen up and stay comfortable (or to not stutter or lessen it) is to break the ice as soon as I can. Try to add some light hearted comments and jokes to make it more like a conversation and not an interrogation. Good luck to you tomorrow!!