Do you really need to know every single NIST document word for word?
Are NIST documents an incredible source of learning material to expand your knowledge and provide clarity for the CISSP exam?
Do the actual study guide books and practice exam question engines use NIST documents as their references when trying to explain topics? Answer: Yes
Basically, if the Sybex book, the Shon Harris book and even Study Notes and Theory, are using documents provided by the National Institute of Standards and Technology to explain topics, wouldn't it be a good idea to just go to the heart of the information?
Answer: Your choice.
The below NIST documents will only enhance your knowledge on the journey to the CISSP, especially 800-34, 800-30 and 800-88. Just skim them, you don't have to read them like a novel.
NIST Special Publication Documents Relevant to the CISSP CBK
If there are some that are not on here, let me know and I'll add them.