I started teaching myself just before Christmas, so I know just how frustrating it can be. I can play some of the pieces from grade two and a few two octave scales/arpegios, so I think I'm doing quite well. Still got a very long way to go before I'd let anyone hear me though!
My reading skills are almost non-existant, so it takes me ages to work anything out and as for my 4th finger intonation, well lets just say it needs some work.
I have found an excellent book that explains very clearly the stance, violin/bow hold(s) bowing techniques and most importantly muscle relaxation. The book is called
"The Twelve Lesson Course in A New Approach to Violin Playing" by
Kato Havas. It's quite old being first published around 1960, but is still in print. I got my copy from Blackwell's (WWW.blackwell.co.uk) for £12.99. Should you wish to find a library copy, the ISBN is 0711998523 and is published by Bosworth.
The book really deals with good tone production and as such is ideal for anyone teaching themselves.
Hope this helps