I think by "posted" you mean shipped?WHAT!! When did you ever have to start doing all this for posted eggs?
I heard that you just let them sit for 24hrs in the cool, warm then to room temp then put them in the bator with turning and wait till day 18 to go into shut down where you lay them flat and turn rocking off.
these were not only shipped, but also arrived damaged (the air cells are detached)!
the air cell is a pocket of air that separates the shell and the membrane. what has happened to my eggs, is that the air is moving around under the membrane - it's not supposed to do that

when I tilt the egg to the side I can see it move like a bubble.
so, all the extra planning is in effort to make the membrane re-heal to the egg.... otherwise, if it doesn't heal into place, it is unlikely that it will hatch! I also don't lay them flat for hatch when detached. whole new ballgame