Hi....This is going to be my first time making a sheet cake. The largest I've done is a 1/4 sheet....She wants it filled, so instead of attempted to torte it, I'm going to bake 2 layers. My question is normally I flip the 2nd layer on top, but with a cake this big, what's the easist way to get the 2nd layer on. Should I freeze it part way, so it's easier to handle?....my worst fear is that it'll break in a million pieces.....
tia!! 
Definitely freeze it! It is a lot easier. I do the same thing - bake 2 layers instead of torting. I would bake and freeze. Then fill and stack while frozen, let sit a little to thaw, then decorate. I bet it will work great.
I have used a flat cookie sheet with no sides to sort of slide a layer on but I think freezing is better - I feel more confident handling the stiffer frozen layer. 
Good luck!
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