Last year, I convinced my bro to tag along with me. It's good to bring along a buddy of yours in case you need to hit the jane/john during the night and you need someone to hold your spot. I wore a down jacket and was somewhat warm, but my bro only wore a leather jacket(big mistake!). We waited online from ~11:30am 'til CC opened its doors @ 6am.
This year, I'll carry a travel mug with me to carry some hot coffee or tea to keep me warm. I haven't faced any line jumpers in my previous years, but if it does happen, there's other people behind you waiting online. I'm sure they won't be too pleased if they try to cut.