Oh, and Ridgerunner's method with the low posture birds being pullets is absolutely true! If they are terrified of you and crouch low to the ground and make a big squirming production of being picked up, they are more likely to be pullets.
I've seen many farms selling anything under 8 weeks as...
Vent sexing is the only thing you can do to sex when they're very young. 5 weeks is usually the minimum for sexing pea-combed breeds. Some claim to do it earlier by the width of the peas (3 rows--cockerel, 1 row--pullet), but I find this doesn't work for EEs. Many birds will make you wait until...