Plan, Plan, Plan - Know what you are getting - get in, get it, and get out.
If your camping out - dress in layers (I'm in Ohio!). About a half hour before the store opens peel down so you don't run around the store in a sweat.
Make friends in line. After spending several hours in line it's nice to have some people around you to watch your spot when you need to run to your vehicle or take a leak. Also nice that people know your face when others accuse you of line jumping when you get back from abreak.
For door buster ticket items - get those last as they are guaranteed. Pick up the non-ticket hottest items first.
Good luck all,
Tim