I kept three hens last year, all laid a few eggs in the fall but I didn't try to hatch any then. Two died over winter, the one that lived is still around and doing extremely well, had no trouble all summer with the heat(I have a good set up for it and not that much heat where I am, so ymmv). She was very comfortable, with no feathers on her breast she could dig into cool dirt and had an easier time with the heat than most of my other hens. She laid maybe a dozen eggs, I incubated all of them but none developed- I have a handful of roosters but none with the balance required to manage har I guess. We'll see if she makes it through her second winter.
Sexing them shouldn't be too hard by 6-8 weeks based on size and comb/wattle.