The safest way to sample Windows 8 is to install it on a VirtualBox virtual machine. It’s fairly easy to set up, there’s no need to worry about partitioning or other issues, and if it doesn’t work for whatever reason (which is possible, it’s a beta after all) then you’ll have lost nothing but a little time.
After completing your installation, though, you might find your virtual Windows 8 complaining that “Your PC needs to be repaired”. But despite telling you to “Press Enter to try again”, or “Press F8 for alternate boot options”, neither option works.
Fortunately there’s an easy answer. Close the Windows 8 window, select your virtual machine in VirtualBox, click Settings > System > Processor and check the ‘Enable PAE/NX’ box. Click OK, restart your virtual machine and this time it should launch properly.