I just did this yesterday, when I swapped the hammer out, I had to remove the control lever. Twosixy walked me through it, and he knows his S*** (stuff), just follow the steps, it looks intimidating, but if you watch what you take out ( digital photos big help of each step), it is pretty obvious how it goes back in. You do need a prick punch (2.5 mm), and a small plastic or brass hammer. I was scared like you, but do dove in anyway, and am glad I did. You can do it, its not too bad.