Every throw in Judo involves every part of your body working in perfect unison and hand throws are no exception. Although it is the action of the hands, arms, or shoulders that is emphasized in te waza in many cases your hip or leg will help the hand action by blocking the movement of your opponent.
A clear advantage of te waza is that you may quickly react to take advantage of your opponent’s momentary lapse in balance; afterall your hands should always be in contact with your opponent! Your hands can always be subtly upsetting your opponent’s balance and then with a sudden push or pull completely redistribute the weight and send your opponent flying. For te waza sucess always focus on the effective use of hands, arms, and shoulders while being aware of the position and movements of your opponent.
Here is a great demonstration of te waza:
Take a look at te waza in competition: