I got a Powder River kit done a few weeks back, not a difficult job. Does require some time (about 90 min, IIRC) but if I can do it, anyone can. I ended up not liking the lighter trigger spring, so called PR and they told me it'd do fine with the factory spring in their kit. Sure enough, it's just right.
My kit was around $85 plus s/h, I wanna say, with another $10 or $15 for the springs. There are two kits, btw. One requires you to drill and tap a new hole on the side of your frame, which I didn't like the idea of doing. I got the other one, which is "drop in*". The "*" means it ain't drop in at all, but it's doable.