I for one am not going to charge someone with those type laws unless they overtly are doing something really wrong.
You will find Georgia to be a very layed back state, not like Commifornia, New York, or Chicago.
You can carry your firearm in your car as long as it is visible, unless you have a Georgia Firearms Permit (which btw, in georgia is open carry or concealed carry) then you can conceal it as well.
I wouldn't really worry about the Georgia knife laws, just as long as you are being a good citizen and not causing trouble. Thats not saying go out there and break the law, don't do that, just keep in mind that with everything in life, if you are minding your own business and not causing "trouble" you probably will not be questioned.
Most peace officers in georgia are very pro-2nd ammendment, and they don't have a problem with guns and knives....Just as long as you remember the obvious, like not carrying a knife into a govt building, school, courthouse, post office, etc...
Even then, like in the jurisdiction that I patrol, almost all college students carry a pocket knife...fine with us, just as long as they aren't useing it in an offensive matter. I don't get on to students who are pealing an orange with a pocket knife...
At any rate, Enjoy Atlanta, and welcome...