I found a very comprehensive video walking you through each step of sealing the tank and installing the petcock & bung.
Unfortunately, due to my very low vision, I would end up drilling the holes in the wrong side of the tank, or like Harold, first gluing myself to the frame and then somehow gluing both the frame and me to the ceiling.
I want to use a Felt 1903 frame and at $770.00 + shipping, I can’t afford a miscue. The black paint on my Worksman BTR was easy to touch up when I removed the chain guard tabs; this Felt build would be far too expensive to mess up. I’d rather pay some sighted person to do it right.