Read the thread, follow the instructions - of course you're going to need a custom recovery to flash almost all custom roms, and obviously you're going to need to root your phone to do that.
If it's important enough to cause you grief if it's lost, back it up. No excuses
Trolling for thanks is lame
Does Samsung's auto-brightness implementation crap drive you to self-harm ? A solution !
Failure to search is the leading cause of male impotence on XDA
If you don't know how to recover if things go wrong, what are you doing flashing custom roms ?