Dual boot windows / mackintosh question - where to partition from

edit: should read “Dual boot windows / hackintosh…” auto-correct issues…

I’m close to getting my new machine so now I’m reading up on hackintosh guides.
Should I install Windows 7 first, partition my drive in Windows and then install my hackintosh on the new partition OR should I first install the hackintosh, partition my drive in OSX and install windows on the new partition?
As a side question, do I need to go into the BIOS for over clocking before any of this or can I do it anytime after both operating systems have been installed?

Thanks a bunch!