DIY counter install or pay contractor?

[Jesse Os]

I am in the middle of a live-in 'flip' and will be doing a kitchen rehab soon. I am considering installing the granite counter tops myself (buy, cut and install) but I am not sure if the price of buying the tools and materials, paired with time/effort is worth it vs. hiring a professional? I am pretty handy and do most of the rehab myself, but I have never tackled counter tops. 

In a nutshell, is it worth taking a risk with moderate construction skills to DIY?