[Q] galaxy s3 i747m ROGERS to jelly bean cm10

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http://forum.xda-developers.com – hey guys let me start off by saying i am a noob to this site and android in general , ive learnt a lot from my galaxy s2 . now i got the s3 , ive rooted it .. however i tried to upgrade to 4.1 awhile back . kept getting error . anyways i want to upgrade to jellybean im sick of waiting like everyone else. cm10 seems like a good rom , ive read a lot on this forum, could some one tell me what the first step is do i flash cwm first on the rogers stock or do i have to put ATT stock on it thanks cheers (HowTos)