Wash and condition hair then apply a suitable curl cream, such as Curls Unleashed Curl Defining Crème throughout the lengths.
Blowdry the hair, but not to the point where it is too straight, as you'll need some texture to form the twists properly.
Once blowdried, your hair should look something like this.
Take small (half-inch) sections of hair and create two-strand twists, using more curl cream as necessary.
Once twists are complete, carefully apply a little mousse (Anastasia used Curls Unleashed Let It Flow Shine And Define Mousse) and sit under the dryer for around 30 minutes, or until the twists are dry).
When the twists are totally dry, use your fingers to carefully separate and fluff out slightly.