Ok so i didn't read properly the second part of your comment. The only thing i can say is keep trying and trying over and over again dont even consider the possibility of giving up, i think that beginning your talk telling to be patient since you have stutter might actually help. Oh also, it might help to lengthen the first vocal of the first word sometimes it helps, also trying to reach the end of a sentence without breathing in the mid (unless the sentence is very long). Ive just heard of these and helped me sometimes but idk how much is reliable for others.