Trim the dough around the edges of the pie pan, leaving 2 inches of extra dough. Fold the edge of the dough under to give it thickness. From the outside of the pan, pinch the dough into a V shape with the thumb and pointer finger of one hand. At the same time - from within the pie pan, press the middle of the triangle with the knuckle of your other forefinger. Continue crimping around the entire rim of the pie pan.