"There really is no difference between successful entrepreneurs and unsuccessful ones except for the decision to do it."

Huh? Both already decided to 'do it', and the there's still a distinction which you're making yourself in the wording - "successful" and "unsuccessful". There's some other difference besides deciding to "do it". I've known a number of unsuccessful entrepreneurs who "did it", but didn't succeed. Some of that non-success was related to them directly, some was timing, some was poor idea, etc. But they still 'did it' and weren't successful.