I started learning colemak via the tarmak transitions at the start of June.
I have not reverted back to qwerty since I started
I would say I have spent about 3 full days a week for 3 weeks on it so far (thats the sum total of my typing for June)
My approach has been to stick with a stage until I exceed 30 wpm then move to the next. Predominantly I have just forced myself to use tarmak at work for everything (mainly emacs) but with a bit of typeracer thrown in for fun
each stage has taken about 3 days - I am currently on stage 3
My observations so far are:
1. It gets really tiring and toward the end of the day after 8-9 hours I tend to lose it - only to feel much better the next morning
2. I think these stages are a really good way of breaking down a very tough task, there is no way i could do this cold turkey direct to colemak
3. being an emacs user i resisted using caps as backspace until today - that was a mistake for sure
4. I learnt to touch type in jan this year and that was much harder again than this is proving to be. It took me 6 months to go from 0wpm to an average of 53wpm and a max of 65wpm (typeracer)
5. I can tell that this will destroy my ability to touch type qwerty - its already going - i'm not a 'multi-mapper'
I feel I will hit > 30wpm by end of july on full colemak, possibly another month to hit my old qwerty speed. So all in, I think going qwerty to colemak via tarmak will take half the effort as learning to touch type qwerty from scratch
Although I am currently rubbish at tarmak/colemak I am already getting glimpses of how much nicer it will be than qwerty
I didn't really appreciate how nasty qwerty was until i learned to touch type at a reasonable speed