http://www.tonymacx86.com/el-capitan-desktop-guides/172672-unibeast-install-os-x-el-capitan-any-supported-intel-based-pc.html
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No. 3960x is an extreme edition processor and uses x79 platform. You can upgrade to i7 3770 or i5 3570 with that mobo. Note that H77 does not support overclocking.
Don't take the psu apart unless you are familiar and well versed with electronic equipment (an electric discharge can harm you). Especially don't try to turn it on while it's out of its housing. Maybe you should buy an sfx psu.