You are welcome! I assisted too early once and lost the chick :(
So learn from my mistake, and be patient while the yolk is absorbed :old It is hard, but hopefully you will be rewarded with a couple of happy healthy little webbies :hugs
I have fairly limited experience with hatching, but that looks like a LOT of yolk and blood vessels. I do not think you should try to assist any further. Moisten the membrane, but keep the eggs in the incubator and do not disturb them tonight. Wait for the yolk to resorb and the blood vessels to...
This article by @Pyxis is the best place to start. Hopefully she can stop by this thread later, but in the meantime, this article is full of useful advice and pictures. Also tagging @shawluvsbirds for further advice on call ducks...