With my first batch, I got 4 out of 18. My current batch, I've been keeping them pretty much upright, with a gradually increasing turn from to side, and the majority of the saddling actually appears to have resolved itself at this point. I'll be laying them down with the large end slightly elevated for hatching. I'm currently at day 13, with 13 viable out of 22 original eggs. Those that I removed were: 8 which never developed any signs of fertility (1 of those arrived cracked), 1 which failed early on, and 1 that smelled rotten on day 5 with no signs of development when examined.
My prep for them was; 24 hours resting with the air pocket up before incubation, 3 days in incubation in the same position prior to starting to turn, and all eggs were sprayed down with 3% warm hydrogen peroxide, then allowed to air dry, before being put in the incubator. When turning, I keep them upright and tip them back and forth, gradually increasing the amount of turn. As of last night, all 13 were alive and kicking. I don't assume I'll get all 13 to hatch, though.
I think chicken eggs, and maybe Seramas in particular from what some people have said, can be difficult. But the little buggers are worth it.
