If #1 doesn't satisfy, and you want lighter and smoother...
I ordered and installed this with excellent results (and I mean my trigger is now light and smooooooooooooooooooth):
Wolff's Shooters Pak (SKU 17120): "...Power Rib mainspring and 1 each of 13, 14 and 15 pound reduced power rebound springs allowing optimum
adjustment of the hammer and trigger functions. These paks can often take the place of expensive "trigger jobs" with better results.."
I don't know how much the Rebound Spring itself improved the trigger, because I replaced both at the same time.
Replacing the Rebound Spring is a bit more difficult than replacing the Mainspring (which is simple), because the screw to remove the spring
is under pressure from the spring itself. Exercise caution, and you should not have a problem. You can order a special tool made specifically
for installing this spring, but I didn't need it. I went with the 13lb spring first, and I have had no issues.
I had no experience with S&W revolver internals prior to doing this. However, I had an experienced mentor looking over my shoulder and giving me tips.
If you do not, I would recommend:
1) A set of gunsmith-quality screwdrivers
2) This video:
Gun Video "Trigger Job: Complete Action Tuning for Smith and Wesson Revolvers with Jerry Miculek" DVD - MidwayUSA