ok good you will know when its not just a hiss it would sound like its gasping for air which could be a RI infection but your cham looks pretty young so i wouldn't worry to much about that unless you see it doing it alot. but more than likely he is trying to tell you to back off lol.
Ok then that is a male then. Which can be good and not good at the same time. Males don't lay eggs obviously but they are usually more aggressive as they get older but thats not always the case. If you can get a really good pic without the screen in the way of the back of the back feet. only...
let me ask you is there little lump looking things on the base of the back feet or are the back feet flat on the backs of them? And i would wait at least a week until you hold her.