Just go slow if you try to modify the hammer yourself. You can't just cut the hammer hooks down to 0.020" like on a 1911. The angles are all different. I messed up some parts before just buying what I needed from CGW or CZ Custom. I've done many SIGs and 1911 trigger jobs with good results. I've buggered up every CZ, however. I've learned my lesson. Now, the CGW parts go from the plastic bag in to the gun without me doing anything but lube and I don't have ANY problems. And these pistols see a lot of rounds with little maintenance.
Joe