My trailer had 16" on center rafters and fiberglass bat insulation. A 14" fan install was super simple and only took a couple hours. I have no construction experience either. Mine was a Surflo kit, which had everything needed, except for a 2x2 to build cross framing. I was able to tap into a nearby light fixture for power. I'm sure the other brands are similar. I know mine was installed correctly and will never leak. In my case it was very simple to find the framing, wiring, etc, just by pushing on the ceiling and sneaking a peak behind light fixtures. It was a little unnerving making that first cut in the roof though. :)