first shot in a defensive situation will be so amped on adrenaline and fear that the weight of the trigger and the take up will mean next to nothing when you snatch it up, and if you have good trigger control anyways, the follow up shots are simple because you dont let the trigger over travel past the reset. a 6lb trigger on a DOA pistol = 3lb if you only let it travel to its reset before you break your 2nd shot.
train, train, train.