You can go ahead and cut them all when the first one pips. Keep in mind that some of them will not come out for DAYS after the first one does. I had one hatchling wait 5 days after the rest of the clutch hatched before she emerged. Nothing wrong with her...just tardy, lol.

Don't expect much movement when you first cut the eggs. When the snake is ready it will stick its nose up to breathe. Then it will rest for another 12 to 48 hours! Once it's breathing, it will be absorbing the rest of the yolk from the egg sac. Once that is all gone, it will emerge from the egg.

The clear gooey fluid is albumen. The albumen is a reservoir of liquid in the egg that retains moisture and provides some minerals and other nutrients.
http://kentsimmons.uwinnipeg.ca/16cm...ioticEgg-L.gif

You don't want to eliminate the albumen before the snake is breathing, but spilling some of it makes no difference.