Lots of good advice here.
When I would work on a sweeps piece I always
watched the story without audio.
Its like reading copy out loud.
It really helps point out all the info you are intuiting/internalizing
without realizing it.
It can point out big holes in the project.
Personally, I never showed anyone a work in progress.
2nd guessing yourself in the middle of an edit
can really derail the whiole project.
Also, take breaks before you need them, stay freash.