How can I stop stuttering?

[Rick]

Remember to breathe and reassure yourself. Positive self-talk is very important and works. The best support you can ever get comes from yourself. Telling yourself things like, "It's okay to be a bit nervous but I feel confident," will help you a lot.

Another way to deal with it is to say something like, "Gee, I must be excited. I'm stuttering a bit."
This way, you don't hide it and by bringing it out in the open you feel more comfortable with it and so does the person you're talking to. This also works well.

BTW it's okay to trip over your words every now and then. We all do it. You can always blame it on being tired.