Sorry I missed your breed of choice and just reread your original post. There are some newer breeds that are indeed able to be auto-sexed. Forgive me I'm old and sometimes stuck in the past where we didn't have these breeds that I can remember. They may have been around but I don't remember...
Crosses are auto-sexing mostly by some characteristic, such as Sex-Links. Are they actually a breed or a cross? If they are already a cross, crossed breeds don 't usually breed true.
I buy the foam and have a tool to cut the holes for the eggs. Are you planning on keeping just the breed or a line? Many times if you mix lines some undesirable traits may come up then it will take several breeding which could equal some years to breed out the undesirable trait.
I sell hatching eggs. I have shipped eggs all over the country and have bought some eggs that were shipped to me. I have had some poor hatches and some great hatches. I do put them in my incubator as soon as I get them but leave the turner off the first day to let the eggs settle then turn on...