Exclamation VZW S4 Root Help!!

Hello everybody! Just got a Galaxy S4 from Verizon with the evil 4.3 update & I want to root the heck out of it, but when I follow all the instructions to the letter, absolutely NOTHING works...no SuperSU, no terminal commands, nothing...this is very tedious and rage inducing.and I also would like to know if it's possible to downgrade back to 4.2. Really not liking 4.3...stupid Knox...

ANY help put into layman's terms would be greatly appreciated.