Thanks for sharing. I bought an incubator after much research. I wanted one without a humidity alarm. Unfortunately, the IncuView All-in-One that I bought had three major issues that contributed to a failed hatch. Customer service was great, but now I'm gun shy on getting something else.
The first signs I go by are how they carry themselves, leg size and general behavior. Males walk more upright, usually have longer, thicker legs, and tend to be the first to jump up on top of things when they're little. I've noticed at even a few days old, the ones that always want to sit on top...
I hope they continue to mind their own business with your chickens. I can't get the image out of my head of the two possum encounters my chickens have had.
When I first had chicks 20 years ago, I bought medicated feed. I either hatch or buy new chicks every year. Probably by the 3rd go 'round, I stopped buying medicated. I've had happy, healthy flocks ever since.
Absolutely! Know how to identify breeds and if they're sex-linked, know the male v female traits. I've had Tractor Supply workers not realize there were male barred rock chicks mixed with the pullets.