Hold the fabric steady with your left hand and start ripping the strip up with your right. I will tear nice and straight. Stop tearing when you have 1/2" of fabric left before it tears right off. You are trying to make one continual piece of fabric strip so measure another 1/4" over from where you stopped and cut and tear, again stopping before it tears completely off. Repeat this process until you have one huge strip.
Untangle your pile and find an end.
Roll the end over itself and around your fingers 2 times.
Slide if off your fingers and pinch the middle.
Fold it in half: top toward bottom.
Start winding the fabric around itself to create a ball. I found going diagonally quite a bit helped out. Of course, winding it tightly will give you a smaller ball while winding it loosely will give you a larger one.
When you come to the end, slip about 1/2" under to secure it tight.