My father is a retired NYC Police Officer, he use to work in Manhattan and Brooklyn during his 23 years as a cop. He has a lot of stories to tell, and one of them is the many times he worked Time Square on NYE. Back in the day, West 42nd Street use to be all pimps and prostitutes, people would constantly get robbed and mugged. Times Square itself use to be a mess, tourists from out of town would come into the city expecting a good time, only to get their wallets stolen and people were getting beaten up for no reason at all.
Granted, times have changed. But the formula is still the same. First off, you have to get there in the morning. Which, judging from the time of this post, you're not going to get there till after 1, even if you left right now. Secondly, you don't have any seats, you find a spot and keep it. You gotta go to the bathroom? Tough shit, you move at all and you lose that spot. Then, after all the waiting in the cold for hours, you see the ball drop. Okay, now what? Everyone is rushing to the subways, rushing to the ferry, it's a mess!
I'm not trying to ruin your evening, but I really beg you to reconsider, especially since you plan on taking 2 tabs each, that will not be a fun experience at all.