The thing that really worked for me was that I was writing a fanzine at the time (1990), so had plenty of stuff I had to type. So I learnt all the keys, was at 20wpm which was slightly less than the 23-25wpm I could do two-fingered, and went ahead typing actual stuff I had to type properly with ten fingers.
tl;dr Have actual stuff to type, use your new skill.
The thing that really worked for me was that I was writing a fanzine at the time (1990), so had plenty of stuff I had to type. So I learnt all the keys, was at 20wpm which was slightly less than the 23-25wpm I could do two-fingered, and went ahead typing actual stuff I had to type properly with ten fingers.
tl;dr Have actual stuff to type, use your new skill.