I believe I have now found active focus and can correct my vision from barely 20/50 down to 20/30. All I do to achieve this is stare at something with high enough contrast for ~30 seconds until the lines become sharper and most of the blur goes away. It doesn’t feel like anything that takes skill or practice. What stops the newbies from being able to do this? Is it mainly about the first hump of getting rid of ciliary spasm?
TL,DR: I am not doing anything when I achieve active focus, I am just passively staring at something until it corrects itself.