I almost never thought about "trying to remove my unconscious doubt" consciously, I just read aloud, talk in my stutter-free zones and also doing affirmations (not as much as I should). I also celebrate every speech victory while quickly forget the bad ones, where I struggled. NOTE: I don't see fluency as the one and only requisite of success. For me, success is that I conveyed my message effortlessly & without any speech-related fears present (other than the "normal" ones everyone has, like the usual anxiety when talking in front of strangers for the first time). (English is not my first language so if I misunderstood your questions, please let me know)