How do you set a skein of wool after spinning it?

Most commercial skeins today are made to be pulled from the center, and they don't need unwinding. If you want to roll the yarn into balls, the old fashioned way is the only way I know of, simply start at the end and lift up on the yarn. Roll it up as it comes off the skein, and then pull more off. It is a very time consuming process. You have to use some care to prevent the yarn from getting too twisted. I usually just let the skein bounce around loose on my lap, or on a clean cloth on the table.