I learned Dvorak in high school and was proficient in it after a couple weeks. In addition to actual practice, I found it helpful to just practice mentally during downtime.

I used Dvorak exclusively and lost the ability to type on qwerty keyboards. This became pretty inconvenient, so I re-learned qwerty, but then I couldn’t type in dvorak any more.

A while later I practiced dvorak again and have been able to switch back and forth without issue ever since (even though I don’t use dvorak very often now).

I found that dvorak wasn’t actually that good for programming due to the positioning of punctuation, math, and auxiliary keys. It’s also annoying for gaming or using hotkeys in general (especially copy + paste).