considering this is my first hatch, and i am in lockdown, I'll tell you what I know.
On day 18, you take out the auto egg turner if you use one, you fill all the water troughs in the incubator to raise the humidity, and you DO NOT OPEN IT until after they all hatch, and then add 24-48 hrs. Since it's so hard not to open the incubator, it's call lock down!!
No you don't have to be there all the time, because I am driving myself crazy watching my eggs!! I currently have 2 chipped, shaking eggs (6 eggs total) I thought I'd start small.
I hope this helps, and I'm sure a more experienced hatcher will fill you in if I missed anything!