I normally play with my friends, so tells
are very easy since I am the best player among them. (They would tell you that too).
When I'm playing with people I don't know, or aquaintances, the shades go on and I say NOTHING during a hand I am involved in. I sit without moving while wearing a hat and shades.
The whole time I am concentrating on my opponent and trying to judge from his actions how big of a hand he has, and then I play my hand accordingly.