Well, let's see. You take your hand and grab a cock. When you are giving a hand job you have to make sure that you don't slip and scratch your partner's dick. So, fancy rings are a no-no! Also, don't forget about his dangling buddies ... they need love, too! And, use your mouth every now and then to keep the sensation going.
Oh hell, just watch this tape with the talented Rain - she is a far better sex-pert!