If someone was trying to sell you a new type of car would you want him to know how to drive? Or would it be sufficient if he just thought he knew how cars worke

If someone was trying to sell you a new type of car would you want him to know how to drive? Or would it be sufficient if he just thought he knew how cars worked? The question was specifically about getting the word out to bloggers I don't see any better way to do that than to BE a blogger and reach out to the audience. It also just so happens that being a blogger will make it easier to test out his app and see what is and isn't good.