My first attempt was self-study using the audio tapes from Chuck Adams K7QO. I learned the alphabet and the numbers, but i failed when the speed was picking up. I think Chuck starts too slow because i learned to count the dits and dahs.
My second attempt was with the Spanish CW group Los Tortugas. This were online live sessions where two teachers walked us through the 20wpm exercises on LCWO.net. After lesson 3 my head exploded and i was not able to get the practice sessions done.
To be continued.