What you’re looking to do here is learn about the customer in their natural environment. Have you seen shows on Animal Planet where they go out and observe wildlife doing its thing? This isn’t that different. It’s not the same thing as selling- you’re learning about what’s going to naturally resonate with a particular type of user/company, not testing your pitch. Watch what your customer does with your product when they get their hands on it. Instruct them as little as possible- remember, you’re using these customers as a sample to understand how a much larger population of users will react to what you have.