THIS IS A GREAT READ:

STEP BY STEP GUIDE TO ASSISTING HATCHING:

particularly to those that have limited experience in hatching eggs. Most assisted hatchings end in disaster and dead chicks. People new to incubating quite often do not realise how long it takes for a chick to hatch from the pipping stage to hatch and try and assist chicks by opening the shells when the chicks are not ready to hatch and the yolks have no been absorbed ending in dead chicks - PLEASE READ THIS GREAT ARTICLE