I too bought one on a hope and prayer. I have an older 2002 F250 shortbox 4x4. I can't even begin to tell you how shocked I was at the install. I thought for sure, even after watching all the videos, that I would have dropped the f-bomb atleast 3-4 times during the install.
Turns out - it was a breeze. You do have to raise the landing gear up fairly high (which for a new 5ver owner was a bit of a OH @#!@ moment) to get it on, but it towed like a dream. If I wasn't getting really crappy gas mileage, I would have forgotten it was back there. Turning clearances so far seem to be more than adequate. I'm going to find a big open space and see how far I can push it for my own edification.