Spinning, that's a great question.
It took me some time to be comfortable with the amount of hermafix I am using. At first I was using it like there would be no tomorrow. All the way around and an X down the middle. My very first roll ran out in two day. Apparent I am not the only one as there is a name for people like me, A runner. I have now settled down to using about an inch on each side. If the item is larger or a heavier cardstock, I might do a bit more. I try to think about how many little squares I would have used and place the hermafix accordingly.