If you are a "hidden stutterer" the mcguire might not be 100% for you though. If the problem is that you are afraid to show you stutter then the problem isnt the stutter, its the fear. Its like treating dogphobia with killing dogs. But it will even help with that, because you work on showing your stutter to people a loooot, huge part of the program. Adjusting is pretty hard at first, but in 3-4 months time its about 50% automatic, was very fast for me.