Once chilled, roll out one disk (save the other for your next tart!) on a lightly floured surface to 1/8 inch thick, or until it is a circle about 2 inches bigger than your tart pan. Work quickly to prevent the dough from getting warm, rotating the dough 45 degrees every few strokes. Transfer the circle into a 9-10 inch tart pan. If the dough is too warm to transfer, put in the fridge to chill for a few minutes and try again. Press the dough gently into place without pulling or stretching (or it will shrink during baking). Patch any tears with bits of leftover dough. Use a sharp knife to trim the dough level with the top of the pan. Place the tart pan in the fridge or freezer until chilled and from, about 15 minutes.