Tread carefully. I have a stutter, and atleast during a trip, it can (at times) get worse. After tripping, it could improve or worsen, depending on how therapeutic the trip was. Mushrooms CAN put you in a therapeutic process where you can analyze your insecurities that tend to worsen your stutter. It can allow you to accept it. It could help the psychological aspect of stuttering that makes it worse. Some people may always have a mild stutter, its their anxieties about it that worsens it. Mushrooms also has TONS of side effects, and perminently change who you are, and your mental state. Dont do it with any intention, as that would make it worse. Some trips, my stuttering worsened... other trips my stuttering improved, but never completely went away, and im okay with that. In the end its all about self compassion, and confidence to speak the way you do without worrying about other people. Tripping on 10 grams would certainly be too much, and NOT a good idea. At that dose, you wont be aware enough for introspection. I wouldn't recommend tripping to anyone, because its impossible to determine how it will affect you. But if you do, have a trip sitter, and take between 1-2 grams.