Everyone has their own methods based on experience. As for mine:
I wouldn't cut anything until at least day 60 and only if the others had hatched already. Then I would just cut a small incision in the top of the egg and take a look. It is possible to do more harm than good.
Yes, very common. I've seen a pair of eggs take weeks longer than the others.But is it normal to have a baby ball that takes I mean like maybe 4-5 days longer to get to a hatch ready stage?
Depends on the stage of development - in the later stages it is likely that no harm was done (if cared for properly). I've experimented with cutting eggs in the later stages and my losses were minimal.How much did I really hinder him by having cut his egg, not knowing he was the only that was days behind
Yes, if it dries out in the egg or you nicked a vital blood vessel. Make sure to cover the cut egg with a clean paper towel that is moist (not dripping wet) with distilled water.Like could I possibly just ruined his chances of surviving?
I've been breeding for a decade. I have yet to see a tangled umbilical cord on a necropsy. I think a lot of people get confused (understandably) at the acceptable positioning of the umbilical cord because they have no frame of reference on a good egg. I'm told twisting/tangling tends to happen with people who move the eggs around during development (e.g. picking them up to candle or examine).At what point do I get concerned about a possible tied up umbilical cord