Comb your hair and take a section the width of a roller. Hold this at a right angle to your head and pull the roller along to the end of the hair like a comb. Wind the end of the hair around the roller, holding the hair taut and keeping the roller at right angles to the scalp to ensure even curls. Fix the roller with the appropriate clip, as close to the head as possible. The rollers stay warm for approximately 15 minutes. If hair curls easily, it only takes a few minutes; Thicker, more difficult to curl hair can take 10 minutes or longer for the curl to set. Carefully remove the rollers from your hair and allow the curl to spring back and cool for a few minutes.