Abandoned duck egg. Need help asap

If I'm lucky I will have a baby before my bedtime! Egg has started zippering
IMG_20180906_123328.jpg
 
How do I tell if it needs help out? And how do I help it out? I have never had to do that before. I do have a cup of water in there for humidity but maybe it's not enough?
All you do is use a tweezer or a knife to follow the zip pattern. Go extremely slow. If any blood appears then stop.
 

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