"They get stronger and you will have some of the hardest time speaking." \-> you got that right on the money. Imagine a tug of war, you are pulling the rope against your monster. The harder you pul 'I can', the harder you instinct pulls back 'I can't'. If convincing removes stuttering, then we would have done it by now so our instinct is always stronger. Instead of convincing by pulling the rope, we should stop pulling and let go of the rope, by not reacting to the trigger. If we say 'I can', then we make the trigger real in our mind, but if we don't engage to the trigger anymore and laern to not have thought or feelings towards the stutter anticipation, then whenever we build stutter pressure in our mind, we just don't care about it and learn that we don't need to do the compulsion because the trigger is not scary anymore (a trigger is just a thought/feeling without judgement or meaning)