There are directions in the manual for adjusting the trigger. Each of the 4(?) screws has a purpose, and you need to spend some time understanding them. Beware that when you make an adjustment that you need to test the gun for safety: i.e., that you haven't induced a situation in which the hammer falls unless the trigger is pulled as for intended use.
One (strong) recommendation: degrease the screw you adjust and then loc-tite it with blue loctite or a similar product suitable for guns. The trigger adjustment screws on the CZs, not just the rimfires but the centerfires too, readjust themselves so that creep will return after many rounds if you don't loctite it. You will need to remove the stock to expose the screws. The job is simple. While you're at it, degrease and loctite the stock screws too.
You probably don't need the other products offered in these responses.
I have adjusted our two 452s' triggers to perfection with the stock trigger and I believe you can too.
