Trembles of hand when firing revolver can be resolve in a few
steps.
1)Ask your instructor to check you shooting techniques to see if
you lock your hands properly, if locked properly that will help a
little.
2) another is breathing technique. First you have to learn that you
are a person that is excited by the shoot, so try to calm yourself
down, trying to control your breathing, slow down your heartbeat
thus excitment. Next when shooting that time, the moment you up
your revolver, take a deep breath but force back 3/4 ( or 1/2 ) of
the whole breath, count as you aim 1,2,3,4 at 5 fire then do the
same with breath and aim 1,2,3,4 count and 5 fire. This way you
will control the trembling.