Practice what you are going to say
Tell your story to yourself. Practice it. Practice using any puppets or props. Get a feel for how it sounds. Don’t aim for knowing it word for word – you want to know how the story goes and be so comfortable with it that the telling is fresh and spontaneous when you tell it to toddlers. Practice will help you to know how well you know the story and how long it will be. Learn your opening sentence, know how you are going to finish – let the rest of the story flow.