The basic "problem" with a J frame is that they are small guns (duh!). That means a small hammer which means a hammer which must have a fairly strong spring to ensure ignition under adverse conditions. As the trigger pull is made lighter, the chances of a misfire will increase. A common workover would include removal of the hammer spur, reducing trigger spring tension, and reducing mainspring (hammer spring) tension, plus smoothing up the action. But, except for smoothing up the action, all those things will ultimately reduce reliability.
So how much are you willing to pay in reduced reliability for an easier action? There is a point at which you will get top reliability and a smoother action IF your gun will never be too cold, or dirty, or have to fire after being dropped in the mud. You pay for the action job, not just in money, but also in reduced reliability. For many that tradeoff is acceptable, since the factory always builds in extra spring strength, etc. If you understand the tradeoffs, there are plenty of gunsmiths who will give your J frame a good trigger pull. But before paying for the job, fire at least 200 rounds through the gun with a variety of ammo. Just because you always use Brand Z, doesn't mean you might not have to borrow ammo in a pinch and finding it doesn't work can be a bit disappointing (as in you are dead).
Jim