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Firstly, as a left handed person, if you are also left handed, learn to use your right hand(You probably don't have time for this though).

I would recommend the Palmer mothod, His book from 1935 is available to download here for free. http://www.iampeth.com/ADOBE_PDFs/Palmer%20Method%201935.pdf

Or if you like dead tree, Amazon http://www.amazon.co.uk/dp/1432596713?tag=callilearn-21&...;

As someone who hated and avoided cursive writing (all my writing is print until I made an effort a couple of years ago) this really helped, but it takes a couple of months if you're left handed (learning to use your right hand) I'm sure a lot less if you're right handed.

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