I bought mine from the CZ USA site and just installed it. If you can drift a pin, the you can install it on your own.
It a pretty amazing trigger for the money. Keep in mind you will need to adjust it. The factory setup is crap, but if you know how to tune a two stage trigger then you'll be fine. If not, you'll need to consult someone who does because it doesn't have instructions on how to optimize it. One of these days I'm going to post a video on how to do it.
Also, it's only for 455's after a certain serial number. If you go to the CZ site it will tell you what the oldest number is.
on some rifle you got to cut some on the stock to get the trigger to fit. same as with the timney trigger. cz store has the serial number range for what is drop in and what is not. either way it is easy to do. the cz two stage trigger is just as good as my anschutz two stage trigger.Did you have to modify the stock to fit the trigger??