Tok36 has given you good advice.
I would only add that the 75's mechanism includes many small parts, but is relatively easy to work on with the proper tools
**. The mechanism that gives beginners fits is the decocker version, which yours is not.
However, before any work commences, it would be to your
great advantage to go shoot 800-2000 rounds, with cleaning and re-lube after each range trip.
CZs always improve with use. Thereafter, you can improve the gun in stages, starting with simple things like the reduced hammer spring.
** Most novices that want to work on guns do so becasue they already have a collection of tools for car and home repair.
These tools are WAY too big. Gun parts by comparison are 100X smaller. So besides the
Chapman screwdriver set, you're going to need a
magnifying headset, tweezers and lots of cups to place small parts in.