My favorite way to roll out the dough is to first place a sheet of parchment paper under the dough and over it. The dough will be hard, so I like to start working the rolling pin over the top of the parchment paper to soften it. Once I get it into a flat sheet, I will remove the top parchment paper, and sprinkle a little flour on the dough and rub flour on my rolling pin. Then, roll the dough out into a 1/2 inch (for chewy cookies) or 1/4 inch (crunchier cookies) sheet adding flour when needed.