I used this kit as well. Turned out perfect. I would second recommendation. I installed myself. But I would not recommend that if you're not comfortable or patient to work with springs under pressure.I used this, it did a great job.
Duty/Carry Spring Kit for J-Frame Revolvers
Hands down, this is one of Apex’s most popular performance upgrades kits. Designed specifically for use in the Smith & Wesson J-Frame revolvers, this kit will: -Reduce trigger pull weight by approximately 3 lbs. -Maintain factory safety values-Dirwww.apextactical.com