https://www.backyardchickens.com/a/hatching-eggs-101
Seriously read this but condensed version...
You can hold eggs 7 days and not have any issues.
store them cool, and turn at least 3 x a day.
We have an old, dry and drafty house. Find a room that's warmest and least entered..
I am using my dry pantry.keep incubator closed, watch temps to keep them at 99.5
I now only candle day 1, and lockdown. Day 1 is to look at the eggs to see if there is cracks.
If they are important, expensive.. I will do a day 10 or so candling.
shipped eggs, you are really lucky if you get 50% hatch.
If your house is dry you may need to add water, I dry hatch.
Day 18 raise humidity with sponges. Try to not open the incubator at all.
Ideal humidity is 70% for me at lockdown.
I line the screen with paper towel so they don't hurt their feet.
Newspaper is awful! I avoid it completely.
Don't remove babies until they are dry and have the brooder box ready.
Babies are fine up to 3 days, so don't rush taking them out.
I leave eggs that are late up to 5 days past hatch date.
If you notice odor, CANDLE and look for that egg! Seriously, smell them, pick them up and take a wiff!
easier then cleaning 40+eggs and an incubator.
I set well over 1,000 eggs of several species last year. the 2 that "exploded" (both chicken eggs!) was when I was out of town for several days.