a couple of thoughts on it .. after first pip, there will likely be blood less than 24 hours ... 'picking' at a shell and exposing a pipped egg to air outside the bator is the msin cause of shrink wrapping .. once you pick shell away, final assistance is going to be needed almost guaranteed, the picking at it and exposing it to cool dry air caused that problem .. timing is everything, sometimes a chick does get out of whack, generally wait 24 hours after external pip, no more no less .. if theres evidence it has enlarged the pip to an actual small hole and its discolored like brownish around the membrane, its peeping pretty loudly, THEN, its a candidate to assist ... carefully chip shell away towards that end with a flashlight inspecting the membrane for red blood vessels ... if theres none continue slowly and rip the membrane .. if its ready it will be pushing as you work and will come out on its own .. any blood its not ready .. this is the most common mistake ...an egg pips and soon after the anxiety gets the best of people and they start trying to help a chick thats ~24 hours away from being ready .. it either kills it or makes a tense very long process you have to babysit the entire way and it was needless to help it in the first place .. final thought is, in a batch of pipped eggs, any you help wil be after the main group is already out ...