Personally, I always write down exactly what I want to say in advance and take the text with me to the presentation. This way I have to concentrate less on the content during the presentation and can concentrate more on my speaking or stuttering. It's also a very good preparation, which takes some of the excitement and pressure off you. Also, you should tell your audience about your stuttering in advance if they don't know about it yet. It also takes some pressure off as well.