The Magic Circle
The magic circle is my preferred way for beginning any crochet pattern that begins with a circle. You can modify any circular pattern to begin this way.
1) Wind your yarn around your finger 3 times. Make sure to have the short end of the yarn at the tip of your finger, and the end attached to the ball of yarn at the base of your finger.
4) Do a chain stitch with the loop still on your finger.
5) Pull the whole loop off your finger.
9) Abra Kadabra.... Pull your short tail and watch your circle magically shrink! Now you can complete your hat, flower, granny square, etc.