I don't know how hard it was for Joseph to come up with a plan to store grain for 7 years....did he know anything about it when he started? How much grain would that be? Where do you store it all? How do you keep it from molding and going bad? How do you keep four legged predators out of it?
He had to start somewhere though, consult anyone who could counsel him on it, come up with a plan...and then just get busy doing it!! There was probably some trial and error...but he did it. Many people lived to tell about it because he did.