I start out by laying the item on my rotary cutting board - it's great because of the marked off inch gridlines that make it easy to measure where to tie the knot so they're all the same length. I do put weight on the fabric end to keep it from moving....usually whatever is handy, like cones of yarn. I insert the 2 sections to be twisted into the ends of the fringe twister. I push the button forward and it twists the fringe.
Then I push the the button in the opposite direction and the entire head of the unit twists in the other direction to twist them together (see below). It is so fast! What a lifesaver. Usually my knots aren't tied that short but this is a throw and I didn't think having a long fringe was the best for it.
AFter all the twisting is finished I pull out my rotary cutter and trim the ends to a perfect length. Usually I use a longer ruler but I was too lazy to walk in the other room to get the longer one sitting next to the sewing machine. Below is a picture of the finished fringe along with the fringe twister (hair twister). I twisted lots of fringe yesterday working on two chenille throws.