Well written and easy to understand. A good 101 on incubating eggs.
I would just add - do not have oils, hand lotion or other things on your hands/fingers as you manually handle the egg turning.
Greasing them up so to speak.
I also think that over humidifying the incubator is the greatest concern. A house usually is about 70 degrees humidity so the basic need is close to being met without adding too much water. if condensation forms on your incubator lid - do not add more until it is gone.
Just remember a chicken does not sweat so a broody hen unless she spits on the eggs is not going to be adding humidity. Not sure how this works in overly humid areas like the South or even the East Coast during the summer.
A hen can only do so much to regulate the heat and humidity of her brood.