I am very experienced in the autograph lotteries. You have to camp all night in the everything else line to even get a shot at GoT autographs. No matter what else is in the drawing that day, GoT will be the one that runs out first and it will run out fast. Last year we got in the line at 5am and by the time we were up to Sails to get in the line, GoT was already gone. The year before we got there at the same time and actually spent a good amount of time in the line for the drawing before GoT was gone. Moral of the story is, 2014 it was VERY hard to even make it to the table to draw for a chance at the most popular autograph sessions. So much so that this year I think I'm going to give up that part of my Con b/c I can't get there before 5am since I drive in.
In my experience though, the WB drawings (which GoT is a part of) have a lot of winning tickets. More than the others. So if you actually get there before your show is gone, you have a pretty good shot. I'd be devastated if I camped for it though I drew a loser, which is possible.....and yes you can get back in line, but it's gonna be long long long gone by the time you get to the front again.