I always tell my students that Rome was not built in a day. We have formed the stuttering habit over YEARS of training our brains to speak that way. It is going to take some time to rewire our brains. I completely understand PWS being fed up of stuttering and just wanting to end it completely immediately. Self-curing is a journey, yes there is a destination to self-curing, but there is no destination to be reached when it comes to the way we speak.
Every day, in every way, our speech gets better and better. I stopped stuttering 3 and a half years ago and I still find that my speech improves every single day.
Nothing worth having comes easy. Discipline, consistency and patience!