Beginner Gardening: pruning help for a giant dracaena fragrans, 1 by rattusses

rattusses wrote:
My corn plant is giant, sprawling, leggy and I have no idea where to begin with pruning and shaping it. Currently it has 7 heads, stands 8' tall and sprawls 7' wide. I'm planning to move in a month to a smaller place, and I'd like it to be a little more manageable. Also, the top stalk is suspended from the ceiling by a plant hook... I'd prefer it to stand on its own.

Any recommendations for pruning and shaping a plant this size? If I cut off a whole stalk, would that root as a new plant? What's the maximum amount of pruning I should do without stressing the plant too much?