It is simple, but there are some things to watch. Be careful when you take the ejector and spring out - you can lose the spring and they often run out of them at CZ USA. (Wonder why). I normally go to half cock to get the decocker arm out. I don't have the link but there is an $8 tool to hook up the decocker spring. FOR ME - it is an essential item. Without it, it took me 40 minutes one time. With it, it never takes more than 2. Its a thing that takes practice.
BUT, for a decocker, it is SO much easier than a 75 series decocker - which i won't touch.