This might help:
With your shooting hand wrapped around the grip, push out from the shoulder (imagine there is no gun, and you are punching the bad guy).
With your support hand, wrap 4 fingers UNDERNEATH the trigger guard, planting the fingertips and wrapping the hand back towards you. Do not squeeze your support hand, you will only tire faster and have muscle tremors, instead, pull back towards you with your fingertips planted, thumbs of both hands together on the same side of the pistol. This will have two effects: it increases pressure on your shooting hand-to-grip, without further exertion of the shooting hand, AND it tends to pull the pistol back towards you....but since you are already pushing OUT from the shoulder with your shooting hand, the push-pull stabilizes the pistol.
Support the weight of the gun with your shooting hand, adjust the aim with your support hand.
And if you are doing the so-called cup-and-saucer, then ya gotta get all of us a cup of coffee! (-just kidding). Cup-and-saucer was fine years ago, with revolvers. Not now.
Hope that helps!