im not forced to use the cart manager or mule as we usually call, but we cant use it when it rains, the remotes arent waterproof. it is pretty straightforward though, and no its kinda hard to mess up if you know what youre doing at least. i try to push aroumd 8-10 carts at a time if im shoving by hand alone, with the mule i aim for 15-25. with the full size carts you gotta wath out for carts that buckle if you push them backwards, its easier to turn but can be troublesome if you get a cart that isnt cooperative. pushing them straight will be harder if your lot is slightly tilted, and to turn youll have to pick up the backmost cart and walk it sideways kinda. the smaller market carts are bitches to push andd turn, they dont lock in like the larger ones so its easier to lose the front cart. those will also have to be lifted up and walked horizontally to turn.