Thanks for all of the advice. Hopefully this makes my practice time a bit more productive. I'm especially going to look for helpful yoga videos.
I went to my dance instructor with the same question, and she told me to make sure I'm always holding frame and posture while practicing my footwork so as not to spend hours teaching myself bad habits.
Initially, I spent extra time memorizing footwork shown on whatever dance instruction videos I could find, but it proved nearly impossible to find good videos teaching standard American Syllabus (taught at my local Arthur Murray studio). I may be be better off just working on what I already know -- I definitely haven't mastered it yet.