All you need is a Ruger manual that shows the "field strip" and the exploded detail drawings. The trigger return spring is on the back of the trigger group and the mainspring is self-explanatory.
Since I have extensive experience polishing various parts of my 1911s, what I did with my KGP-141 was to take the trigger group apart, the hammer out, and the mainspring spur and mirror polished any friction bearing surfaces with a light smear of jeweler's rouge and a felt polishing wheel on the ol' Dremel running at about 20k rpm. Then I took off the rouge and buffed the surfaces with a clean felt wheel at 30k until the wheel disintegrated and flew off. I went through about 12 wheels.
After the polishing, I can run the 9 pound Wolff mainspring and the 8lb trigger return spring. I have about 500 rounds since the trigger job without any ignition failures.
Trigger pull is 8 lbs DA and a shade over 3 lbs on SA. Smooth as butta' in either mode. It is fast becoming my favorite handgun because of the ease of which it can be worked on.
I cannot think of another handgun where one can change the sights without a sight pusher or staking tool. The grip is endlessly customizable. Atop all that, it is easy to detail strip this revolver for crying out loud, a task I would not dare on a Smith or Colt the second week I had it, like I did with the GP.