i use egg cartons for my hatching - - cutting the bottom of each individual crate out. the chicks have no issue getting out of the egg (i was concerned about that, but it's all good). they still knock the other eggs, but i suspect not nearly as bad as them just laying in the incubator.
i agree with one of the previous posters - all of my eggs have hatched within 24 (ish) hours of one another. i've read where some eggs are hatching for a period of a few days, but that has never happened to me. the ones who haven't hatched by day 22, again for me, do not hatch. there are things you can do to try and tell if the chicks are okay in the egg or not. read up on that.
with my most recent hatch, i put paper towels on top of the wire in the incubator in hopes of making clean-up a bit easier. that worked nicely. if you haven't hatched before, get ready for a mess - - and i mean an icky, gross mess.