Two suggestions...
1) if you are just interested in previewing Windows 8, I would just load it as a guest VM. You would need to install a VM application such as WMWare, or VirtualBox which is free. I have a few tutorials that go through the steps on how to install Virtual Box, configuring Virtual Box for Win 8, and installing Windows 8 CP as a guest.
The reason for this is that once you are done with your review, you just delete the guest VM. No additional reformatting or changes to your host system are required.
2) if you want to upgrade your hard drive, then you just need to make sure that your laptop has the appropriate interface to allow for an SSD drive. Remove the old, install the new, then reinstall the host OS. I would recommend you install Windows 7, then install VirtualBox, then run Win 8 as a guest VM.
JorgeM
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