I've been working on Getty & Dubay "Write Now" for 3 or 4 weeks now (not continuously! -- just grabbing a spare half hour when I can). I'm about 2/3 of the way through the book but I thought I'd post a "before and after" (or, "before and so-far") progress picture. The scrawl is what I'm trying to get away from, and although I'm still at the "rank amateur" stage, I think at least my legibility is improving :-)
One thing I've found useful is to start a "Commonplace Book", for my more careful efforts. I do keep notebooks and a journal, and for all of those I've now switched to italic from my old mess. But because they're "working" books, I still write reasonably quickly in those, so they're not the best place in which to hone my italic. I also sometimes forget I'm trying to improve, and slip back to old style for a few letters or words.
By contrast, by its nature a Commonplace Book is, unlike the general notebook or journal, primarily for copying quotes from other people. Since I'm not thinking about *what* to write, I can focus on how I'm writing it. I also write much larger (for now) in my CP than I do in my notebooks and journal, so I can work on details of the letters. (I'm also still practicing in the Getty/Dubay workbook). The "after" in the picture is in my CP.