For all of you who can't wrap the thread around your finger and roll it off the finger w/ your thumb....
When you're finished wrapping the thread around your index finger, now you've rolled the thread off your index finger w/ your thumb....Take your middle finger and hold the glob of twisted up thread against your thumb and then pull the needle/thread away, allowing the knot to form while "tightening" everything up???
As you're rolling the thread off your index finger, the thread must twist up, or the knot won't form.