For whatever reason, sometimes we do need to cut our lino down. Whether it's into a smaller size or a required shape, the best way to do this is from the back!
It's much easier to cut the hessian backing than to carve through the lino and then through the hessian from the top - save your energy for carving your design instead!
If cutting into smaller sizes, a ruler can take out the guesswork if uniform or regular pieces are required. If a special shape is needed ...