http://www.handwritingsuccess.com/write-now.php
I had no penmanship, and I had to print in order to write anything legible. I went through the book, and I now have a usable and readable cursive style, which looks much better than my old printing style. I'm not an artist, so it's not pretty, but it's readable and efficient.
Bonus: the entire book is hand-written in the style that it teaches.
I recommend Write Now also.
Also, try different pens and different paper. I write better with "rolling ball" pens, the kind where ink just sort of flows out of them, rather than cheap ballpoints where you have to press down on the paper. But cheap paper causes the ink to bleed and look messy.
Apparently, I need to re-train my muscles, rework everything and then practice. I guess I now have a New Years resolution and goal for 2015. FML!
I thought I was alone in this because I've noticed over the last 10 years my handwriting has become horrible!