Replacing tailgate?

My MDX tailgate was damaged--broken window and dented metal beyond repair. I see ebay sellers offering used ones for $500 or less, which is the amount of my deductible. Given the age (2004) of my MDX, I'd like to consider a DIY repair to keep it going.

I see two bolts on each hinge are visible when the tailgate is lifted. The tailgates for sale on ebay seem to have been removed from the other side--maybe inside/above the rear headliner? I am aware that I would also have to find out where the wiring harness is fed.

Has anyone done this swap, and is it particularly difficult? Thanks for any tips.