There is a difference between becoming an expert vs becoming reasonably good at something:  An expert means reaching the lop level in one's field. Being reasonably good at something means you have moved from 'grossly incompetent,' and can now handle that activity reasonably well. If your goal is to have a reasonable understanding of some field, you can achieve your learning goal in 20 hours.

It is not humanly possible to practice all in a twenty-hour stretch.

A distributed practice learning method is achievable. It would roughly mean 45 minutes of practice for a period of thirty days in a row.

For instance, writing every evening for 30 minutes can give you a reward of a 25 000-word book in a 5 - 6 week period.

Remove any obstacles that may distract you from practicing your sub-skill. Television is the biggest culprit, followed by smartphones.

Learning something new will come with some frustration. That will be a time to safeguard yourself from any distractions so you remain focused on learning the skill.

• Break the skill into various small parts, remembering that every big skill is a collection of many sub-skills.
• Identify the essential sub-skills needed to give you the maximum advantage.
• Practice the most important part that you have discovered, using the 80:20 principle in your learning.

The major obstacle in learning anything new is not intellectual - it is emotional.

The fear of sounding stupid stops us. In reality, you can learn anything if you wish to with a little daily practise over a repeated period of time.