I went cold turkey sometime in about 2011 or 2012. The only reason I did it was because I was finishing college at the time, and I was afraid that I was losing the ability to rewire my brain on a muscle-memory level. It was a pain in the ass; writing papers on a deadline using a keyboard with which you are not familiar can be incredibly frustrating.

I tried to mimic the programs we used when I was in elementary school to learn the keyboard - start with getting the home row keys under muscle memory, then expand outward slowly from there. I would mindlessly (and slowly, and often incorrectly) transcribe TV shows as I watched Netflix, which helped a bit.

The thing that made the biggest difference was buying a keyboard cover [1] (as opposed to trying to re-arrange the keys on my Macbook Pro and not having the right home key nubs). The keyboard cover really paid for itself; it made the whole learning process way, way easier.

I guess it also helps that macOS makes it incredibly easy to swap between keyboard mappings. It takes all of 5 seconds to add the Dvorak keyboard and a quick shortcut to swap between Qwerty and Dvorak (I use cmd-opt-ctrl-space). (I have to keep Qwerty around for things like Blizzard and Steam games, and Steam itself, which often don't understand virtual layout mappings)

On the other hand, whenever I set up Windows, it takes about an hour or two to figure out how to set up a second keyboard layout, you can't change the keyboard shortcut to swap between them, and often when my computer goes to sleep, the layout is reverted. My Google-fu is pretty strong, and I still have an incredibly frustrating time re-learning how to set it up again. I don't if that's others' experience, but I hate going through the process.

It does get easier. You're retraining your brain to do something very fundamental. One piece of advice I'd have is that if you're getting so much anxiety that you're avoiding it - change your methods. Maybe it means going back for a day while you think of a new plan for learning. Don't wear yourself out over an extracurricular activity; it's just not worth it. Also: I don't know if there's any scientific proof that Dvorak is any faster or better or easier, so I'd say if that's the reason you're switching, well, you may end up disappointed.

Bonus: have you ever seen that Vim learning curve picture [2]? Yeah, the first part of that graph is about 3x more difficult using Dvorak. ("hjkl are for movement and it makes sense because they're all next to each other" etc etc etc). Still worth it IMO, though.

EDIT: It's crazy that I struggle to type meaningful sentences in Qwerty on a keyboard these days, but I still type in Qwerty on phone keyboards. I even tried to use Dvorak on the phone once and it was basically impossible - it's almost like it's a completely separate stored muscle memory in your brain.

1: http://kbcovers.com/dvorak-keyboard-cover/ 2: http://www.thejach.com/imgs/vim_learning.jpg