I personally don’t mind when someone tries to finish my sentence, I hate feeling like I’m making people wait for me and usually I can mime them in the direction for the right word. I do a lot of miming lol. But it’s different for everyone. The thing I’d want people to know is that while anxiety makes my stutter worse, I’ll stutter regardless. Me stuttering isn’t a sign that I’m stressed, nothing annoys me more when people tell me to “calm down” or to “take my time.” You’re not going to fix what a childhood of speech therapists couldn’t.