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The goal here is to find a method of feeding the yarn smoothly through the hand not holding the hook so that there is a consistent tension on the yarn as you are hooking it. There's no one correct way to do it; you should find the method that works for you most comfortably, but there are a few standard techniques you might want to try. One method is to loop the yarn around your pinkie once (start with your palm facing you; put the yarn in between your pinkie and ring finger, from back to front; then loop the yarn around your pinkie and pull it through between the pinkie and ring finger again, from back to front, then put the yarn through between your middle finger and index finger, from front to back, and have the yarn come up over your index finger). Or try weaving the yarn between your fingers, staring with your palm facing you, and the yarn over your pinkie, between your pinkie and ring finger, from front to back, then bring the yarn behind your ring finger and between your ring and middle finger to the front, then between your middle and index fingers, from front to back, to loop over your index finger. Another method is to just wrap the yarn over your index finger twice, starting again with your palm facing you, and putting the yarn between your middle and index fingers, from front to back, and looping the yarn over the index finger. Experiment to discover which method feels most comfortable to you, which frankly might take a while, so be patient with yourself!