1: Build needs refinement - Watch a pro player of your class stream and copy some of their builds, changing a few here and there to suit your personal needs! In my case, I was too defensive in my skill sets and couldn't take down anything..
2: Needs more farming!!! - You'll be surprised what kind of gear drops / rolling is available in act 1 inferno! Just start ques at the imprisoned angel 'begin quest' , farm HoA 1 , 2 , warden, HoA 3 and butcher again and again! I got a helm that sold for 2.8 mil gold within an hour from those runs apart from others that can range anywhere from 50k - 2mil gold! Those gold = phat lewt from AH = progression!
It's possible to do act 2 with insufficient gear, body hopping and going for bosses.. But you'll get stuck eventually if you don't farm! That said, act 2 is significantly harder than act 1 and it actually takes almost a full set of inferno gear to complete with most post-nerf build unlike act 1 where you can have a combination of high end nightmare loots - hell loots!
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