I used to do stance and motion in front of a mirror. I would be able pick myself apart and correct little things with my stance and footing. I am a highly visual person though. Plus I'm incredibly good looking.
I still get in my stance in front of a mirror from time to time. My wife laughs at me. "I caught you!" she'll say.
Schlottke's right though. I would walk around my house in my stance or pretend someone had my wrists and do hand fighting/wrist roll drills. We wrestlers are crazy people. Let's not deny it.
Dude, you haven't met my neighbor...they don't have a mirror to fix that, believe you me!
I don't see anything wrong with practicing some of your moves and your stance but don't just concentrate on that. Conditioning for strength and flexibility is more important than perfect technique.