I never read any of the book(s?) in which the quote featured...strangely, though the work is a favourite among geeks.
I *was* able to fill in the quote, though it required solving almost all of the non-quote clues.
Several of the short words were easy to guess. The key element was 1d, which is thematic and thus not too hard to intuit from a few other solutions.
To be honest, I was lazy and never bothered to figure out the long anagram.