I definitely agree with the part of the article on the whole visualization thing.
...interesting! For me instead, visualization never really helped, even in other disciplines.
While the "baby steps" approach the he describes as physical method has always backed my progression.
It's like my body needs to try a move several times in a very controlled and awkwardly stiff way before it gives green light to my mind.
After that point it's all downhill and it feels like the body knows what to do (a sort of muscle new-memory), and the mind can focus on pushing harder, or being more precise, or else... the body starts trusting the mind and tells her: "go ahead, tell me what to do and I'll do it...".
Even bails feel safe and somehow controlled...

The only visualization I have been able to do, has been revisiting mentally some move, later at night... but that was mainly for pleasure , not to overcome fear or building up confidence.