If you've got a CZ-75B then it should have a block on the firing pin as well as the manual safety. If you don't pull the trigger then the gun won't go off. A lot of modern guns have internal safeties in addition to the external safeties. If you have a good holster for your gun then you shouldn't worry about the trigger accidently getting depressed. If you should happen to drop the gun on accident just remember to let it fall. Don't try to catch it.

The most important reason to carry condition 1 is because when you need your gun you'll probably need it RIGHT NOW. Do you want to have to take the time to rack the slide before it becomes useful. One advantage to concealed carry is that the person that's threatening you probably doesn't realize that you have a gun on you. You'll be lucky to get the oppurtunity to get to your gun in the first place, let alone get it and then have time to rack the slide. Also, if for some reason you only have one hand free then it'll be that much more difficult to get the gun into action. Modern handguns are designed to be carried condition 1.