I think Ferret makes some good points. His advice for cover probably doesn't do much after you get some attention from big bets, but certainly will make a favorable first impression. After reading one of his earlier posts I went to Walmart and bought a "white trash" costume. It has to be better than walking in looking like a MIT student.
I think looking a bit scary has other benefits. I am hoping people won't talk to me as much, as I can't hold the count through conversations all that well. Also, I have decided that this new person I invented doesn't tip more than a dollar. Tipping too much is becoming a problem for me. Lastly, this "white trash" guy I invented wears a hat and sunglasses which will help with HCing.
As a low stakes counter, I don't get noticed much. Playing $5-$10 games, it seems like you are ok as long as you keep it under $100. When TC hits +5 the $200 bets come out, "checks in play" gets called, and the winnings roll in I leave after the shoe. I'll hit a different pit or play poker. I always feel like going back to $5 or $10 after drawing that kind of attention is a terrible idea.