all that you need to do is have a piston removal tool(angel tool kit) and remove the piston (first thing you see as you remove your end cap/volumizer or whatever you may have on the front of your angel. Once that's done, make sure you don't loose any of the spring stack(hard black rings) and make sure they stay in the order they are. Then just add the shims needed making sure your LPR's between 85-90psi.
best of luck.
-The Edge Is Strong-