I did read that. As I mentioned, the pre-paint prep doesn't have as much to do with a final smooth, glossy finish as the after-paint prep. Even if your body was glass-smooth before painting, you'd still have an orange-peel texture after painting your color & clear coats that would look just like your black body does now. To get from that stage to a baby's-ass-smooth glossy finish is where 75% of the hard work is.
Edit: Removed. I can't link to YouTube at this time.
Edit 2: Rather than tie up this topic with explanations, I PM'd you some YouTube vids showing the wet-sanding and rubbing out techniques, in case you want to put in the work and get a beautiful glossy finish on your Blackfoot. Good luck and enjoy!