EB:

I have had lousy handwriting all my life and they never gave it a big Latin name like that!

What cracked it gfor me was being made to sit down and slowly and carefully duplicate well-formed upper and lower case cursive letters from a book, for several hours, several days in a row. By the end of it I could turn out reasonably well formed rapid script.

Back in my day this was called "training" and was used in a variety of subjects, configured to fit the circumstance, of course.

A