I've had success with when my stutter acts up, to take a deep breath for like 2-4 seconds before continuing. I mostly do this with people Im more confortable around. Ive also has success speaking slowly, and sort of giving them a slow BPM in an even rythem if that makes sense. Ive also been able to get going when I try to say want I want to say quietly before and ramping up the sentance as it going volumewise.