All above is good advice. I will add what I do. With shipped eggs I take them straight out of the box with out tipping and place them upright in a carton. I examine all for damage or cracks and if they are not too cold, I put them into the incubator that is already heated and ready. I do not turn for four or five days. I hand turn every egg. I do not have an automatic turner. When I candle, I do not tip them. When ever I must handle them, I do not tip them. I candle on day seven, fourteen, and day eighteen but I am ever so careful. I had two eggs of the shipped Fogle HRIR with large saddle air cells. Both eggs hatched beautiful chicks.This is good advise..I have a few things to add..for shipped eggs it depends on if you have LF or silkies/bantam. The bantams ones you need to heat your incubator to 101 for the first 24 hours of incubation. Than turn it to regular heat. 100-99.5. Silkies need an extra day of higher heat in the beginning.
The biggest thing about shipped eggs is air cells and attachment. I get my incubator set up and going steady. Than unplug it..set the eggs inside (fat end up)and the next day plug in the heat. I gently check air cells in a few after day two and when they attach I turn on the turner. If it pushes it to day three I turn it on and just hope for the best. I do not handle shipped eggs like I do my own. They are more fragile and should not be handled. I check at day 18. I do not *lock down* until first pip. Air cells are more important than anything in shipped eggs. I put my humidity up or down depending on air cell development.
Humidity 30% till first pip. 55%-60% humidity after I see first pip or hear chicks.
I agree with del on bantam or Silkie eggs. They are the fragile of the fragile. I do candle but treat them extremely carefully. I also raise the incubator temp higher and do not raise humidity until first pip with Silkies.