Not actually being omniscient but operating as though you are presents some interesting challenges, too.

SIRI and Hal 9000, I'm looking at you.

I'm cobbling together a first-person quasi-omniscient narrator and settled with something like being able to see every possibility, but not knowing which one will collapse. Having an omniscient narrator who is not the MC allows me to go hard on the irony, too.

I'm totally saving that loss of omniscience concept for later. :O