Can't believe no one as posted any kind of response yet, Kittykat! But here goes.
Doing a full blown trigger tune on a revolver involves more than the average owner should attempt. If not done properly, it can be made dangerous or non functioning.
But, Wolff makes an Action-Tuning "Pro Springs" kit, offered by Brownells, and if you can disassemble, and reassemble with springs from this kit, you'll have a good start on a better trigger pull.
Here's a link to J-Frame kits... http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=731&title=PRO+SPRINGS
The inner workings of a S&W revolver are not for the inexperienced to meddle with. You must know what you are doing to avoid making it unsafe. Do yourself a favor and leave the job to a competent professional.
Unless you are familiar with the complete assembly and disassembly of these firearms and how the parts function, this is best left to a trained gunsmith.
Just a little too much polishing or improper filing of a part and you either get an unreliable firearm or have to but new factory parts to start all over again. S&W is pretty proud of their hammers & triggers to just tinker with them.
Replacing springs is always better than cutting springs as there is a science to the lock, unlock and function of heat treated gun springs.