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Installed a UR UDP on my Maxima. Took some time, but wasn't that bad. The Z/G should be pretty similar as well. You can do it, just be careful when loosening the tensioner bolts...
I recently installed the KJR lightweight pulley. The install is pretty straight-forward but it helps to have somebody else with you to step on the brake pedal when you're trying to break the bolt loose.
You can download a copy of their installation instructions from the website: