I'm a little late to the party. Firstly, best wishes for graduating and what a great idea for a documentary. I think dedicating a small part of the documentary to some "a day in the life of a stutterer" footage would be really eye opening to non stuttering viewers. You could record them in a social setting with their friends, observe the physical challenges (facial ticks etc, coping mechanisms, opening their mouth to speak and then giving up without anyone noticing but the cameraman). Once this part is done you could then interview their friends privately and ask their opinion of stuttering in general, and then ask how much of an impact they notice that the condition has on the stutterers life. I think that makes it more real than just reeling off information about the condition. The key is to engage the viewers and make it relatable - everyone goes to the shop, everyone has to interact with people whether it be by telephone/in store/ in person/drive-thru. The key is to show the challenges stammerers face whilst doing these everyday tasks. Good luck!