All the cgw stuff is not hard to put in. Once you take the hammer trigger and sear cage out it isn't hard to understand how to reassemble. I put a race hammer 11# mainspring, barrel bushing, lighter recoil spring, cgw shadow 2 disconnecter and I go back and forth from single to double action. The cgw barrel bushing makes a ton of difference. If you look at the parts layout and videos all the work can be done at home.