Lean your body instead of the bike so you won't hit the pedals on the ground. Aside from that, follow the wheel in front of you like you said. You will feel cramped by the tight spaces, but you can't freak out or YOU will be the cause of a crash. Once you get comfortable with the traffic, glance down through a corner and muse at the fact that you're directly over the wheels of the guy next to you. But don't muse for more than .1 seconds! lol