even if you totally bollocks it up, it's very easy with Odin to get it all back to stock. You'd have to do something majorly stupid to 100% brick it (and even then, Samsung have been known to reflash it if you are nice/pay).
You can also relock the bootloader and remove the flash count. That is supposedily a little more risky, but I don't see why you would want to do that.
even if you totally bollocks it up, it's very easy with Odin to get it all back to stock. You'd have to do something majorly stupid to 100% brick it (and even then, Samsung have been known to reflash it if you are nice/pay).
You can also relock the bootloader and remove the flash count. That is supposedily a little more risky, but I don't see why you would want to do that.