I had a book of tunes that that gave the same tune in different bowing styles, marked all the way through. If I find it's title I'll let you know. But following the bowing meticulously did me a power of good, even though I don't play any of the tunes as marked. As another self-taught fiddler, I found that I eventually my bowing, paradoxically, became much more instinctive.
As for the left hand, judicious use of droning on an adjacent open string, where it sounds OK, is a great help in keeping in tune, as is playing with other musicians.
And practice, of course.
Power to your elbow
Richard