that's right, outside of quail colors, and especially solids, you just have to wait. No trick to it, they'll be what they are eventually. A lot of people want to comb sex them, that generally works for single combed breeds, but in pea and rose combed breeds, it means little for chick sexing. Feather sexing of these is the only sure fire way to know, and it just takes time is all.
once you start to see pointed saddle or hackle feathers, THEN you know you have a boy.
as JJ mentions, the quail color has it's laced trick. and the buff Columbian based colors, quail, mille, and of course buff Columbians have the red in the wing bow area on the males. Females will only be pale buff. If you ever see the redder areas on the shoulders, that's a boy version of feather sexing.
cuckoo, you can tell at the hatch based off the size of the head dot they have. That's the only variety that works on though.
All others, you have to wait til adult plumage starts to come in on, anything pointed is boy, rounded is girl.
red combs, or bigger combs generally means boy, but in rose comb breeds is at best only 75% accurate, so I don't put much faith in it.
let 'em be a baby for a while, and one day you'll look at them and see it clear as a bell