I moved from a regular keyboard (freestyle hunt-and-peck) to a corne (touch typing), ditching qwerty for Colemak Mod-DH. It took me six months to really get comfortable with it. At month four I was almost ready to kick off the training wheels (the training wheels here being the layout printout I looked at while typing).

Five years later, I have no regrets. It's easily the best thing I've done for productivity, ever. My fingers are my BCI. Effortless.

I keep the two halves far apart: wider than my shoulders so my arms are angled outwards and my chest is up and I'm sitting up straight. And I modified the keymap to work just the way I intuitively expect it to.

I can still type ~60wpm on qwerty on a standard keyboard. My phone is qwerty and I have no issues typing on it. Muscle memory of my posture and arm position makes this possible.