After you snip it, you are going to work the fiber out so that you can grab it and pull. As you pull you will notice that it will start to gather. The more you gather the rounder it becomes. Make sure you don’t pull to hard! Keep working it until you have gathered all the way to the end.
Here is a picture of how I wrapped a candle holder in burlap and then hot glued a rosette onto the center. Cute Huh?