Step 10:
When finished, you should have a dough that looks like this:
Now, place the dough in the refrigerator for a half hour. During this time you can clean up the mess you've probably made on your counter tops, and prepare your cookie pans. Greasing them should work fine, but I usually use parchment paper because a) I can move a whole pan to the cooling rack at a time and b) makes for very easy cleanup.