My first snubbie... still unfired as of this writing:
Good looking revolver! Great picture.
Since you have laser grips, you can get a lot of very valuable practice, before you even go to the range. The 642 is a great revolver. The staged trigger enables you to slow-fire it almost as if you were firing single action.
Practice holding the dot on something and squeezing off without moving the dot. I promise you that if you do this a lot, it will improve your trigger control on every DA handgun you fire. I have one just like yours, and it is one of the guns I never intend to sell. It is surprisingly accurate, once you adapt to the short sighting radius and master the laser.