I have done the install, and it was pretty easy. Heed the previous quote, that it is heavy. I did manage the entire operation singlehanded, However, I wouldn't repeat it. I just got in a situation where it was my only option.
The 14x14 hole is all you need. The trick with pre-wired is whether the wiring has a conduit to the opening. Mine did not, so I had to drill one in. Not hard, just added 10 minutes to the job.
As has been mentioned, no holes, just slides in, bottom attaches and it acts like a clamp. Way easier to put one in that to change a vent. Just be sure to clean old sealer off as best as you can.
With a pop up even the weight is not as much of an issue, the roof isn't that high. On mine I had to lift it, then step up onto the side rail of my pickup, then push uip and over. Again, not a task I would repeat.