I used these Spencerian workbooks off Amazon! There's a theory book as well but I kiiiinda skimmed it since I already had most of it down from my calligraphy experience, but it's worth a read if you're starting from scratch :)
There are also these workbooks, on Spencer's writing method. It's possible to do them all with a monoline tool like a fountain pen, but the paper it's physically printed on won't take much ink, so you'd had to fill the workbooks out in pencil, ballpoint or gel pen.
This is the set I've been using, hope it helps :)
Be careful the size of the book is a little bit smaller than what you would expect
Is that a Rocketbook? Probably not but the way some of your beginning letters fade in is the same way writing with gel pens on my rocketbook looks.
" Looks like you're scribbling like your life depends on it "
That is pretty much how I see it too. Once you learn proper cursive letter forming and the proper way to connect letters, you will be able to write neatly and fast. I just picked up a new Spencerian workbook packet to practice my fundamentals and already realize the genius in cursive writing for speedy and legible note taking. Just practice and practice some more my friend. Maybe pick up a fundamentals book like this one. It is dated but still very applicable. At least it is what works for me. I suppose there are different methods for different people and situations. I have increased my neatness and writing speed tremendously working through these fundamentals booklets in just a couple of months. It is a challenge though to correct 32 years of bad habits. Check out the user reviews at the bottom of the Amazon page to see what the copy books look like. The main text of the packet is dated and I just pick through the information but the practice workbooks are golden.
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Edited: replaced link
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Edit: Well ok the customer images at Amazon don't really show the workbooks in detail. But you get the idea. You start with basic strokes and then by book 5 you are into complete sentences. Each book should last you about a month to work through. They don't want you to cram it all in a couple of months because you don't absorb as much. I know it seems I am really pushing these books but I stand by them. They have helped me tremendously. I'm off my soap box now.
Not OP, but you can get them from amazon.
These are good and free to download
http://archive.org/search.php?query=Spencer%20AND%20subject%3A%22Penmanship%22
If you prefer a physical copy:
http://www.amazon.com/Spencerian-Copybooks-without-Theory-Penmanship/dp/0880620951
Yes! This is what I bought: http://www.amazon.com/Spencerian-Copybooks-without-Theory-Penmanship/dp/0880620951
This is the free pdf for it (credit to /u/consurvatur) http://docdroid.net/oxwk
Spencer has long been dead so I wouldn't feel bad about using the pdf, but literally the day I bought the set they I saw the thread that had the pdf link. They're really helpful if you take them seriously and practice ~10 minutes every day.
These are great, I'm surprised nobody mentioned Spencerian copy books. Here's a link: http://www.amazon.com/Spencerian-Copybooks-without-Theory-Penmanship/dp/0880620951
http://www.paperinkarts.com/hourgl.html
Hourglass Adjustable Oblique – I wanted holder that I will be able to use for a while and not have to worry too much about what nibs I purchase for it.
Gillot 404, Hunt 101, Hiro 40, Brause Extra Fine 66, Walnut Drawing Ink – I’ve read a lot of suggestions that said to get a variety of nibs to start so you can find your preference.
http://www.paperinkarts.com/cprpad.html Copperplate Practice pad – this is to help me learn the right angles from the start
Copy books and a theory book – my handwriting is already a bastardization of various scripts, so I feel that I should start over and learn it right.
What you currently have, and what Pilot Parallels are are called broad edged pens. Italic is a broad edged hand. Spencerian, on the other hand, is a pointed pen script. Although I don't do pointed pen hands, you need a pointed pen nib, and preferably an oblique holder, instead of what you currently have. See the wiki.
To learn Spencerian the IAMPETH website as well as the Spencerian Copybooks are recommended.
I'm not sure whether learning Italic first is recommended or not. Someone who is more knowledgeable with pointed pen scripts should speak up :)