I couldn't agree more with Wheelgunner and BIgMuddy!
Yes the Power's parts may cost about the same as a trgger job depending on where you get it done but consider these bonuses:
1. You get a guaranteed superior result and consistent from gun to gun if you do other guns,
2. with the half cock feature (that you do or do not have to use when reloading) you eliminate the annoying problem of going past the point of chamber-to-loading gate alignment and having to turn the cylinder all the way around again,
3. they are drop in parts with excellent instructions,
4. you get the satisfaction of doing it yourself w/o having to get in line and wait weeks for a gunsmith's backlog of work, and
5. you can order the Super BH hammer if you want a wide spur (see below).
I highly recommend Power Custom parts either ordered direct or from Brownell's with a very fast turn-around; cal or order on-line.
Wide spur hammer on my 1983 vintage NM 357 converted to 38-40 w/steel grip frame and ER housing.