Why help hatchlings hatch?

[Stewart_Reptiles]

(Hopefully this is still on-topic LOL) I always wondered how you would know that you're not accidentally cutting the snake or anything important? Is there a specific way to cut?

Pinch the egg (toward the end of incubation it will get more pliable), make a first cut and than a second, your ideal cut is a V shape cut with the flap falling back down on the egg, nothing worse than those HUGE open roof that looks like they have been cut with a chainsaw.