I've found that practice that 'feels too small to be useful', is very helpful in building practiced skills, without triggering fear or akrasia.

Do real practice but on a small scale. Create an opportunity for repetition, which is where fluency can be learned.

Try to reduce the fear of failure or loss to the point where you can learn what works and what doesn't without creating excessive emotional stress.

A related idea from Education theory is called Precision Teaching (http://www.fluency.org/), and is about measuring both speed and accuracy on many brief tests.

Thanks for the article, EvelynM