I'm a new CZ 75b owner myself. When I checked into trigger options, I pretty much came away with the opinion it is a job that you can do yourself,
BUT probably not something you would want to try unless you already had some gunsmithing experience under your belt. The reason was that certain critical parts may need modification to get everything working correctly. If you are dead set on having some trigger work, I'd send it to CZC or try a drop-in option first if you want to try something yourself (see below).
My recommendation for you is to first get some snap caps and click away, then put at least 500 rounds through the gun before you make any decision about a trigger job. All I did was replace the stock mainspring with a 15 lb. spring and the above, and the trigger just keeps getting better. At this point, I have pretty much decided that I'm happy with the stock trigger without doing anything else.
A drop-in option that should be worth considering would be a hammer kit from:
http://www.cajungunworks.com/index.html