Basically, when tillered, the limbs will taper from fades to the tips in thickness and width. When you come to a knot you try to center it in the width of the limb and leave it proud from back to belly. If you can't center the knot in the limb, leave extra wood around the knot from side to side. Also, you want to follow the undulations of the back as you taper the limb thickness. Those "hoop-ti-dos" are decieving and take concentration to tame.