Hi! This is what worked for me...I did lockdown on day 17, I had my temp and humidity day 1-17 99, 35-40%. When I did lockdown I tried to keep my temp around 95-100, and humidity around 70-80%. I stopped turning when I did lockdown, and I ddnt open up the bator until mine started hatching and they were playing hockey with the other eggs. Depending on what type of bator you have-I have a little giant still air. To up my humidity I filled the water well, then put 2 sponges in there, placed the sponges under the air holes. When I saw that the humidity needed to be upped during lockdown I poured VERY hot water thru the air holes onto the sponges.
I am going to try shelf lining paper so there is a better-easier walking surface for the chicks and when I turn them. I removed the chicks that hatched when I had about 20 out, and around 5 left to hatch. The chicks were popping everywhere, and it was a mess in there so I made sure my humidity was up well over 80% and removed the chicks very fast.
I ddnt start hearing them peep till about day 21-22, mine didn't hatch till around day 23. But you will be able to hear them no problem with the bator closed...they are quite loud. Also be prepared for the stinky smell from the ones hatching...not pretty but normal. Just make sure your humidity stays above 70% and temp 95-100, and make sure you can add hot water to the bator without opening it to adjust the humidity and I'm sure you will be fine. Find a book, movie, house cleaning to do otherwise you will drive yourself nuts with anticipation...or talk to your friends here. Try to relax and enjoy the experience, it will go by very quickly. Good luck!!