I farm lots of it, and the easiest way to do it is just to get hold of it at the base with forceps and lightly tug it free from the rocks....It pulls right off with a bit of a pull, and then has a base area that takes to the new substrate VERY readily....you don't get the massive snotting that comes from cutting, and the remainig ones still fill back into the cleared areas, they just take a little longer than if cut to grow right back in, thus you don't have to do it again QUITE as soon....
Just the experience speaking, I actually just delivered like 25 - 30 heads last night....