1000% let your instructor know beforehand about your stutter!!! That way, they don’t subtract points for something you cannot help. I’m a senior in UG currently and I’ve done many presentations. 90% of people are too stressed about their presentation to be concerned about yours. 5% of people will be kind and pay attention and be listen to what you say and look beyond your stutter. They’ll be the ones to say you did a good job after class. The remaining 5% of people will be assholes but its not your job or responsibility to teach people how behave. Its their parents who failed them. Don’t give yourself that heavy burden.