Below is the source for Trigger, Hammer, and Hammer Dog Shims.
http://triggershims.com/ruger_double_action.html
Below is the GP100 Trigger Job tutorial.
https://gunner777.wordpress.com/2008/08/24/ruger-gp100sp101book-of-knowledge/
Below is the SP101 Trigger Job Tutorial which has more pictures than the GP100 one.
http://www.sp101trigger.com/index.html
You have the Wolfe Spring information above.
Read a little, and watch some You Tube Footage, and you should be on your way.
Bob