You will “think with your hands” while Prototyping, bringing your product to life. Prototyping is all about the user. Trying, user testing, then trying again are key in the Prototyping phase, which means quick, dirty, and cheap is the way to go. This will allow you to fail at no cost, financially or otherwise. Remember, failing while Prototyping is not a bad thing — it can teach you how to improve your concept.
While Prototyping, your team should pull in users and experts early and often to get advice and feedback. The trick here is not to get defensive — instead, simply listen, taking in as much as you can and using that information to make your Venture Canvas even sexier.