I am just learning. I am looking for two rows of feathers on the wingtip. The "upper row" when the wing is upright are from primary feathers. The lower row when the wing is upright are to be convert feathers. There are differences in how "fast" these things feather in males or females. In Males, the two rows will be more "even at the ends" or more parallel at the ends than in a female of the same hatch, breed and age. Harder to tell when you have onely one sex to inspect. But in general...the primary feathers on the female shoot out longer than if its a male, relative to the converts on bottom.
edited to correct "less" to more.
edited to correct "less" to more.
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good luck 
