I suppose I have a couple tips....probably repeats, but emphasis never hurt....
If you're staying in a room, bring your food! Believe me, it was a lifesaver last year to be able to go up and have some snacks every once in a while. it keeps everyone's energy up and keeps everyone HAPPY.
Drink lots of water and juice, and bring ibuprofen or advil or whatever. Lots of viruses going around, it doesn't hurt to have a little extra protection. You don't want to go home halfway through saturday!
If you're cosplaying, make sure you have emergency repair kit or someone who can do quick repairs. it's never fun to break a heel and retire a costume instantly.
DO GET SLEEP. I know you feel like you'll miss something but you'll miss more if you pass out from exhaustion.
Bring emergency money....extra food, a taxi maybe....you should just prepare for anything.
Come with friends, but make new ones there.....i haven't met a mean person yet at NDK.
Respect the staff, they're your friends. always and forever.
Don't let that one drama queen ruin the whole con for you. or make you miss the concert. It sucked last year because we were staying RIGHT ACROSS from the band, and do we get to go? no. of course not. So, in short, leave the drama queens at home.
Try and do everything you can within reason. You'll make better memories that way.
Don't be afraid to ask for pictures!
Carry around a small bag for money and camera and cellphone, etc. Pockets get full fast.
and remember.....have fun! hope to see you guys there shortly. ^^