Don’t begin prototype review sessions without clear guidelines for feedback. Be very specific about the type of feedback you are looking for. (Are the steps logically arranged? Is the navigation clear and intuitive?) If not, be prepared for, “I don’t like the blue in the header,” or “Can’t we use this font instead?” or “Can you make this bigger, bolder, in red and flashing?”
Don’t be a perfectionist. In most cases, rapid prototyping does not have to be 100% perfect, just good enough to give everyone a common understanding.