In september I am going to be a Master student Risk and Safety Management to become a Quality Health Safety and Environment Manager (QHSE-manager) in the future. What I noticed from my internship in that same role is that while I am still stuttering occasionally when you grow in your job and you are getting more familiair with co-workers and clients it will get way better and I became way more fluent. The biggest compliment I could get after 2 months in was that they did not even notice my stutter anymore! With all this is also depends on your co-workers. If they are even the slightest professional they will give you all the time and understanding you need. If not talk about it!