you dont throw someone that has never swam before, into the deep end and tell him its in his best interest to hold his breath.

instead you find the easiest way just to get him to try it, even if he aint going to use the pool ever again. atleast letting him get his toes wet he will see how easy it is to say "yes customer heres a QR code". once they have got their toes wet, then you introduce them to the art of swimming, diving in head first, or somersaulting into the deep end (investing).

another analogy
dont throw 5 eggs at him at once or he will just defend himself and the eggs will just hurt him and break. instead gently hand him one egg and and then a second egg.