When I bought my OEM hitch, I was asking around at different shops to install it. After all, it's just a hitch. Bolt it up. What's the problem? I didn't have the time to do it myself. When it came down to it, I did install it myself and am I so glad that I did. For it being "just a hitch" there is a whole lot of detailed steps in following the factory instructions. I'm rather particular when it comes to things being done the right way, so I did everything perfectly as it was supposed to be done according to Infiniti. The install took a while and I had some thinking time. I mostly thought about all the steps thatI was doing and that any random shop I would have taken it to would not have done. They would have slapped it in and considered the job done without taking the extra steps of care.
My experience is from the 1st gen and maybe the 2nd gen is different. Knowing what I know now, I would only install the OEM hitch myself or have the dealer do it. Let U-Haul or somone else install it if it's an aftermarket hitch. In that case I think it's just a hitch and bolts right up.