Default [Q] Galaxy S3 4.3 SGH-1747 Root Help

Hi People of XDA!
I am a noob i just got a galaxy s3 and it came with 4.3 installed and it is indeed the at&t model.
I used to have a iPhone and i know all about iOS and jailbreaking
but i dont really know anything about android root
So can someone please tell me how to root my s3, a noob friendly guide because i dont really know alot about android
Please if you could send me a noob friendly guide on how to root a 4.3 galaxy s3
Thanks!