I’m a pharmacist in my 40s. I remember hospital rotations during pharmacy school where I’d round with the docs and there was always a few words that gave me trouble. Very embarrassing. My stutter began around 12 years old and was pretty bad for many years. I never sought treatment until I was in late 20s and at that point I was much like what you describe. One of the tricks he gave me for “problem words” was to intentionally put them into a conversation or to intentionally stutter on them. It puts you in control of the speech. My stutter isn’t cured. It still comes out sometimes but it’s mostly when I’ve had a couple drinks or get myself really worked up about something. To be honest I don’t give stuttering much thought anymore. I wouldn’t worry too much about curing it. Instead focus on gradual improvement and taking control of your speech. You will still stutter sometimes but don’t stop saying those problem words. It only reinforces the mindset. The more you force yourself to say them the less the stuttering will happen.