Think of stuttering as an iceberg model i.e. 10% is what you see, 90% is what you don't see. The act of stuttering is just the end result of a myriad of other things that went wrong i.e. word scanning, anticipation, anxiety, past negative associations, etc. Imagine having a fear for a snake or some exotic animal, and the FEAR that runs through your mind and body when it is presented in front of you. That is the typical day for a stutterer when he placed in a speaking situation. It's constant fight or flight. Those who find ways to overcome and manage stuttering are those who choose the "fight" response and commit to therapy and putting themselves in risky speaking situations to correct the feedback loop going on in their minds in regards to stuttering. Some advice I would give to you if you want to become in SLP and have to work with a stutterer is to focus on the therapy aspect of it and cognitive restructuring. Speech therapy will give you the tools I really believe that, but it needs to be applied and under professional supervision. I don't believe speech therapy is effective in 3 weeks or in followups. I truly think it will take months with consistent supervision and monitoring in every speaking activity i.e. telephone, family, friendship, workplace, telephone, public speaking to be effective. One bad experience can set a stutterer off the wrong track again and the entire foundation to speaking fluently is messed up again. It's so tricky. I wish you could borrow a stutterer's brain for 1 minute to have a light bulb moment to what it actually is.