A smooth and light double action trigger pull is a joy to use and an aid to accuracy but a complete "trigger-job" requires a certain skill set and should be left to professionals. Aftermarket hammer and trigger springs are a popular way for the amateur tinkerer to improve the trigger pull on their revolver without getting into the risky work of stoning, polishing and fine tuning the internal parts. Lighter springs do not make the trigger pull smoother but the weight of pull can be significantly improved.
The trick is to lighten the pull without compromising reliability. Too light a hammer spring may cause misfires and too light a trigger return spring may result in the trigger not resetting in rapid double-action fire. Either situation could be a disaster in a self-defense handgun. Choosing the right weight springs for a light but reliable trigger pull can be confusing for the novice.
Apex Tactical Specialties, Inc. has taken the guesswork out of the process by introducing a Duty/Carry kit with springs of the optimum tension for both a lighter trigger pull and 100% reliability. Of course, you should always thoroughly test your carry gun yourself after any alterations. Thus far, Apex only offers these kits for the Smith & Wesson J-Frame revolvers but kits for other models are expected to follow.
The kit contains a hammer spring, trigger return spring, and an Apex XP firing pin kit. It is a fairly simple installation but as the great American philosopher Clint Eastwood said, "A man has got to know his limitations." Removing and reinstalling the side-plate requires a gentle touch to avoid marring the finish and installing the trigger return spring can be tricky without the right tool, but the mechanically inclined should have little difficulty. I suggest before starting you invest in a Brownell S&W Rebound Slide Spring Tool. It will serve you well for years to come. If you are not mechanically inclined, have an expert do the installation for you.