The core of the program is the coastal breathing technique. Breathing through the diagram before you begin speaking and speaking when you exhale. That should reduce the frequency of stuttering. When you do end up stuttering you need to apply the block release or hit and hold technique. The first technique speaks for itself. The second one is 'attacking' the feared word by saying the first letter loudly and by prolonging it. Another core principle is deliberate disfluncy aka stuttering on purpose to desensitize yourself.