I once helped to move my customer's new Epson 9900 (44") up a fairly wide, carpeted stair that had a right turn landing half way up. We had three strong guys and it was NOT easy. If I were you, I'd have two people on the lower end and one on the top end, since most of the weight will be on the down side. The lack of room in a stairway compounds the problem and makes it difficult for four hands to find a place to hold the printer.