It's easy to pick up. Mastery depends on your dedication and technique. I just printed an image of the layout and taped it beneath the monitor until I remembered where all the keys were and went from there. Typing tutors were boring so I just started using it instead. If you just keep going through the painfully slow period, you get functional quickly enough.
I didn't touch type before Dvorak. If you're already fast in QWERTY and don't have any RSI issues, then it may not benefit you much to switch, but if you haven't learned proper typing yet or have discomfort, it could help. From the touch typing I do in QWERTY when I have to, I know that my transcription work would be significantly less comfortable if I had to use it.
If you want to learn something like this, just play it straight and don't try to take the easy way out of anything, and it'll work out.