Oo, oo, one of my favorite subjects!
As an adult, I had terrible handwriting that seemed to be getting worse and worse over time. I finally made up my mind to improve it, and have had great success. My handwriting isn’t perfect–I just don’t have the patience to hone it beyond a certain point–but it is legible to everyone, even when I’m not making any special effort to write neatly, and, IMHO, it’s much nicer looking than it was.
I used the book Teach Yourself Better Handwriting by Rosemary Sassoon. The book teaches the Italic alphabet, which is well suited to printing as well as joined writing. It’s not at all like an italic typeface. It’s just a nice, clean style of writing.
The book has lots and lots of exercises to do, and that’s the key. You will not improve your handwriting without practice, practice, practice. Practicing drawing straight lines. Practicing drawing basic letter shapes. Practicing letter combinations. Some of the exercises seem pointless, but just keep trying. Even when my exercises looked awful compared to the examples in the book, I was still improving my control, and it showed up in my writing. The time you invest in practicing pays off, over and over again, in everything you write!
I used to think that people with nice handwriting were concentrating on every letter they wrote, and I said to myself, hey, I’m not gonna waste brainpower on making my cursive perfect when I should be having Great Thoughts about what I’m writing. So I had rotten handwriting that nobody could read (sometimes not even me) and I was proud of it. (And, damn it, I always sound like a Christian witnessing when I talk about this. :)) Once I started practicing and saw an immediate improvement in my handwriting, I wished I’d found this book in college. I think of all the notebooks I’ve filled with crabbed, messy writing, and realize that my class notes would be a much better resource for me if I’d improved my handwriting sooner.
If you want to improve your handwriting, I recommend that you find a book like the one I mentioned. Avoid books for teaching little kids how to write (which is a very different process), and look for books on retraining an adult’s handwriting. You might want to get some different books from the library and try them all, then buy the book you like best. Practice, and stick with it! This is a process that doesn’t have a clear endpoint. I still find little things to work on now and then so that I can improve my handwriting even more.