We recently ordered Humalog vials but instead received pens. Our son has tried pens in the past and prefers vials. I contacted the pharmacy and they admitted the error but said that the insulin can be drawn from the pens and used just like a vial. They were supposed to send me instructions on how to do this but I’ve yet to receive anything. We’re just about out of the last vial so I was looking to see how this works before it’s time. Has anyone done this before and if so how easy or difficult is it?