Late to the show on this one, but I will give my 2 cents. It took me 2 years for me to get myself to do it. (why did I want to stutter...on purpose!?). I found a SLP because it was the only way I was going to do it. First time I tried it, I had a panic attack. But it gets easier. Sometimes when I have a big block(s), I stutter on purpose for a second, and I feel it calms me down a bit. Like you said, there is a lot of fear involved. When I did the voluntary stuttering, it was the start of a slow realization that even though I was starting to accept my stutter, I still had a lot of fear. A lot of my conscious fear has been greatly eliminated, but what I have realized that my body still exhibits fear, almost on a subconscious level. You develop the fight or flight mechanism during childhood stuttering moments, and those feelings were so engrained in me for decades. Even if I dont feel fear, I could be totally calm, my body still sends those signals to my brain, subconsciously. I'm learning to evolve my relationship with my stutter.