Neaten up the edges before attempting anything fancy, so that you have the same amount of material to work with all the way around. Use kitchen shears or a very sharp knife to trim the excess dough to about ½ inch away from the rim of the pan. For a single crust, lift up that edge and fold it underneath itself, so that it’s resting on the lip of the pie pan and the cut edge is hidden. Continue folding all the way around, straightening and smoothing as you go. The simplest crimp is made with the tines of a fork; just press the fork into the rim again and again until the lines match up in the place where you began. My favorite sort of crimp is done with just three fingers; use two fingers on one hand to press the interior side of the lip, and one finger on the other to press the opposite side of the crust in the center of those two fingers. Repeat all the way around to form a tight scalloped design. For a larger, loopy scallop, turn that single finger into a hook and press that into the side of the crust, using your opposite hands to indent the larger space on either side of the “U” shape.