You know the Spock live long and prosper thing. Learn to do that with your pointer and second fiinger, then the ring and pinkie. Then to really gain control, make the spock then and without your other fingers move your 2nd finger over to touch the pointer. You can also make the spock and just move your ring finger over so it touches your pinkie. After a while you get so you can move so your fingers kind of looks like scissors.
Give it a try.