Floorpan

For anyone who's put a floor pan from a 67+ A-body into an early A, What are the biggest problems? I've seen some pictures from old threads here, but they are usually small or lack detail. Our floor is pretty much gone and needs to be replaced and I'd rather not piece meal one together. I would probably need to do halves, or cut a full one down the middle just to get it inside anyway.
I've never replaced a floor, but to install a complete floor you would have to remove windshield and probably dash and steering column to get it in car.
I don't think it would fit from the side. And you would definitely need 2 to 3 people to maneuver it. Lots of stuff to scratch inside if not protected well.