Anybody who can do a single action revolver trigger can do it, but try this first.
See the FAQs about trigger work and taking down/reinstalling the bits.
Sit in your favorite chair and watch a movie and cock and release (pad the hammer fall), just like shooting it. You can count if you want, but why bother, just do it until you cant stand it anymore. This burnishes the parts in without the cost of ammo.
Take it apart, if you have a very fine stone just run it a few strokes over the side edges, NOT the contact surfaces or tip of the trigger and hammer notch. Clean and dry well.
Oil the pin holes of both parts and put a smear of automotive type 'anti-seize' compound (ask your local mechanic for a half a thimble full) on the hammer notch,
Reassemble and try it; bet is is 100% better for free.