To prepare each pizza, dip the ball of dough into flour, shake off the excess flour, place the dough on a clean, lightly floured surface, and start to stretch the dough. Press down on the center, spreading the dough into an 8-inch or 10-inch rounds, with the outer border a little thicker than the inner circle. If you find this difficult to do, use a small rolling pin to roll out the dough.