Regarding the entry I just posted, and the references therein to neurotic uncertainty over whether a book is DONE, this quote from William Strunk, Jr. (the original author of the classic Elements of Style):
It is worse to be irresolute than to be wrong.
Boy, do I hope so. :)

Funny thing about writing a book — at least if you’re neurotic enough (and I am that neurotic): you never really know if it’s DONE. The best you can hope for is that it’s done enough.