I switched to Dvorak about 2 years ago. I am happy that I did, it feels so much more comfortable to type on than QWERTY. It just feels much better on my hands and as I work on a computer 8 hours a day I find that really important. I’m also a musician so I basically need my hands all day. So that’s why I switched; purely for ergonomics.
I switched while on the UHK. I wanted to use a customized version of Programmer Dvorak, something you can’t easily achieve on a regular keyboard. (See my setup here: Setup: Extended Programmer Dvorak layout ). I learned this through an online typing course and I switched over as soon as I knew enough letters to form a proper sentence.
Yeah, making the switch takes time and energy for sure. I could type on QWERTY with mad speed before I switched and now I can’t type that fast anymore on either layout. But that doesn’t really matter if you can type fast enough to get stuff done.
There’s a couple of things I learned that I wouldn’t have expected beforehand. I wanted to learn Dvorak while keeping the ability to type QWERTY. Mainly because completely banning QWERTY is highly impractical in office situations. At first, keeping them both was really hard, as I tried to switch back and forth on my UHK a lot. However, after a while I found out it is easier for me to type Dvorak on my UHK, and QWERTY on basically any membrane keyboard. It’s like my brain linked either of these layouts to some kind of feel under my fingers and now I can switch effortlessly. So if you intend to keep QWERTY on the side for some reason, maybe that is something to try.
So this is completely opposite to what @maexxx did haha (not that there’s anything wrong with that, it just shows that there’s many ways to go at it 
). I did not ban QWERTY for life, for practical reasons. I made it my mission to become “bilingual” in that way and it’s going really well. So only my UHK is on Dvorak and everything else is set to QWERTY so I stay fluent in both. It’s hard, but it’s definitely possible! It did take me months to get to a point where that got comfortable, though.
Anyway, good luck on your journey!