Hey Steve:
I go it alone too, and although I've had some coaching from a few local folks, the thing I find most valuable is video taping. I'd recommend getting a small, inexpensive (like a Flip) video camera and taping your squats. You can then post here, watch yourself between sets etc. This has made a big difference for me, even if not as good as a coach or training partner.
Good luck, and don't give up.