Actual speech therapist here. A couple of cheap tips for you. I work with clients to help them habituate these tricks, but a lot of it oils down to a) try not to stress about stuttering and b) stretch out sounds that you are going to stutter on. Regarding the stress, there are breathing techniques the help relax your throat and vocal cords. A lot of stuttering has to do with breathing, so this is not just a bunch of crap. There is some science behind it. Also, emotionally coming to terms with your speech not being perfect will make a big difference. Everyone is disfluent sometimes, so the goal is not to let it inhibit your ability to communicate. Third, self-disclosure is a great way to decrease the stress. As for stretching sounds out, start with sounds that stretch easily like m, f, s, th, sh. Practice lists of words starting with those sounds. Do what the others have suggested and take a deep breath, ease into the sound, and make it long and smooth. After you get the hang of it in easy sounds and single words, increase the difficulty by doing phrases or sentences with those sounds. But never practice disfluency. If you are stuttering while you practice, simplify it and slow down. Then try the harder sounds, like g, k, d, t, b, p. Take your time and don't push to the next difficulty level until you are pretty successful and confident with what you're practicing. Over time, shorten the amount you're stretching the sound until it is almost "normal". But never practice disfluency! Always practice fluency. Feel free to dm me if you want to talk more.