FYI -I am using the TMOBILE Samsung SIII - initially, I struggeled getting into Recovery - after a bunch of trial and error I found the only method that works for me is: Hold Volume Up/Power/Home simultaneiously - release all three as soon asthe words "Samsung" (in block letters) flashes once - a second of two later you will see Samsung in a fancier type face - screen goes dark once more and then you are in CWM.
WHen I tried launching recovery any other way I coudn't get there - the phone would either turn off completely or it would boot simply launch the normal start up.
I didn't know if others had the same issue as I did when they first tried launching recovery so I thought I would share -
LOKI /ˈlōkē/ A mischievous and sometimes evil god
(Thanks to djrbliss)
Former Devices: Galaxy Note II, Galaxy S3, EVO 4gLTE, Nexus, Epic 4G