Ensure even isometric pressure (pushing with your firing side hand and puling with the support side hand). Do not squeeze the grip. A good Webber stance helps. tuck that support sight elbow in to the body, and extend the firing side hand - but do not lock the elbow on the firing side arm, it should be able to flex slightly to absorb recoil and assist in fast recovery for the next shot. After you first shot remember to "trap" the trigger and reset (don't slap the trigger and allow it to simply be released) - fire a shot, hold the trigger to the rear of the trigger guard and slowly let it go back until you hear a 'click', hold at this point then apply pressure again to fire the next shot - you will have no slack to take up and the 2nd round will be almost instantaneous. If you ever use you handgun in defense then this is essential - if the first round doesn't do the job you need to be able to quickly deliver subsequent rounds as quickly, but accurately, as possible. On a double action (and any handgun for that matter) you should start to take up the slack as you present to the target (not before you have 2 hands on the gun if your drawing from a holster, but certainly as you are pushing the handgun outwards and aquiring your front sight.