I've studied professional writing, won a couple of competitions and have a couple of minor publications, but I still feel like there's so much to learn and so many ways I can stretch myself. Hubgarden has been a great boost to my confidence as a writer.
No formal training, other than school and university essays....
I've always enjoyed writing though I don't see any need for formal training. I don't think many successful writers have had training, they've just sat down and written!
Like VerityG, most of my writing experience is based on school/university essays. I have been an editor of several newsletters and magazines (community publications) and several of my letters get published in the local and state newspapers. I think personal writing experience is the best formative study. I often feel that when I have written the "best article ever", and clicked on "publish", I read it one more time and find mistakes! Urgh! No such thing as perfection! :)