A wall, fence, or rail can offer similar support, just like when you are learning to ride. You reduce the amount of falls while increasing the practising of the correct motion, even if you don’t get the full feeling of balance.
I learned wheel walking on a 24x3" tire. At first I wore a helmet because I felt unstable and sometimes slipped. I felt my biggest breakthrough came when I started practising on grass. It just seemed more forgiving somehow, maybe it was cos I feared falling, but perhaps it suited the tire. I remember thinking about John Childs’ “Heel, toe, heel, toe” mantra after reading this thread, and found it to be useful too.
I don’t know what you were searching for but there are heaps of threads…
Wheel Walking question
Wheel Walking
How to learn Wheel Walking
What am I doing wrong? ww