100% you have to work at it. I always state that I believe the speech therapist is a key part of the process. That I don't believe in techniques to provide fluency. But that I am familiar with what other rely on as techniques. Many of these techniques were part of the progression to fluency that was part of my therapy. One key difference I believe I experienced was the controlled environment where I developed fluency. That I was not permitted to use my fluent speech outside of therapy and private practice sessions until I had achieved consistent and reliable fluency. I liken it to speaking two different languages. But instead of an English speaking person learning Spanish, and not using Spanish in public until achieving fluency, it was a disfluent person learning fluency, and not using fluent speech in public until achieving fluency. What exactly are you seeking for authenticity? I think you can see from my history here that I don't promote any product or group. I'll often suggest that people seek out qualified SLPs who specialize in stuttering. And that local Universities can be a great starting point to find qualified SLPs and programs. Let me know if I can be of further assistance.