Too often, I believe, much is made about the weight of the trigger pull while ignoring the other nuances that collectively make more difference. For example, in DA shooting, the trigger return can make a huge difference in fast and accurate shooting. Also, the smoothness of the trigger, when and how the trigger breaks, if and where stacking is felt during the trigger travel, all can have a deleterious effect even with a very light trigger pull. Some things only indirectly involve the trigger, but can make a difference: the sides of the hammer making contact with the frame for one example.

Bottom line: tuning the action of one's self-defense revolver is not the best way for a "hobbyist" to self learn gunsmithing. If someone truly feels that he cannot work with the trigger, the revolver should be taken to a certified gunsmith who understands the intricacies of the double action revolver. Should you ever have to actually use the gun in a self defense situation, you'll be glad you had a professional gunsmith do the work when A: you prevail in the shooting and B: you prevail in court afterward because the prosecution had no opportunity to paint you as a reckless blowhard who tinkered with his gun on the kitchen table in order to make it more "deadly."