Yep! You can reduce personal anxiety but not system anxiety. You will build anticipation of a stutter, if you are uncertain about the fact that you cannot speak without stutter (having no confidence) or if you believe that you won't make progress (having no confidence). Since you cannot reduce system anxiety, the best next thing is to listen to the anxiety without changing it. Learn to speak with (system) anxiety, that it's not a threat and learn to be comfortable with it