I know Sabayon uses a Graphical installer, but is it as easy as Ubuntu? I've never learned how to manually partition my HDD. Can I reinstall Ubuntu with 500, then delete the partition, leaving it as Free Space for Sabayon to take up? I do not want to risk Win7 since I have no possible way of reinstalling it. Could I let Sabayon overwrite Ubuntu and not touch Windows 7?

Bonus questions, what package management system does it use? Does it have as many Packages as Ubuntu? Does it have the long compiling/updating package time that Gentoo has? Can I use Compiz? *I haven't used it in a while since 11.04* What're the benefits of Sabayon over Ubuntu?

Another thing. Finals are next week, should I postpone this until after they're over or will the installation be brief enough for it to not matter?

Seeing as you are concerned and experimenting, why not install it on a virtual machine first so you can see what, if any, the headaches are and then make an informed decision.
I believe all of your questions above can easily be answered in this way as well as viewing the documentation from the Sabayon site.

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