I'm seeing a lot of similar answers to mine in the comments so I hope there's something to go off of! 1. 'S' sounds are by far the most common for me, 'F', 'M' and 'N' sounds are also up there. I've found out that it's more of a block when these sounds are at the beginning of a sentence, I can usually get it out with only one repeat: S-snake, F-fish, M-monkey. The rest of my sentences go just fine as long as I string the words together evenly. 2. My way around it that I've always done is to quietly/quickly say "uh" right before the problem sound. I can always get it out fluently if i say "*uh*\-snake". But i also notice this makes me sound like I'm pausing to think of the word, rather than just using a sound to get the word out fluently. On a really bad-fluency kind of day my secondaries come out: my eyes weirdly look up, i take lots of sharp, short inhaling breaths before a problem sound and I sometimes pinch my upper lip under my nose. I also have found myself scrambling to think of a synonym to avoid a problem word just like a lot of people on here. 3. I've never really had someone finish my word for me, because I usually only have to repeat the first syllable one time. I guess you could say I have a quick stutter and don't get stuck on a sound long enough for someone else to interject. I agree with a lot of the extra stuff in others' comments. We don't stutter in our heads, we know exactly what we want to say it's just sometimes a struggle to get the sound out. I stuttered much worse as a kid, and I would get upset when my mom (who's a speech pathologist, go figure!) would just tell me to slow down and take a breath. I knew exactly what I wanted to say, but felt like she just doesn't understand. That's why I'm glad i found this subreddit full of people who understand what it feels like! So thank you for taking the time to learn about it from real people! and not just typing a couple extra letters for everything this particular character says