I agree I just finished charnel whispers and it is a much better book on the subject. It gives steps that are good for the beginner without saying “oh by the way if you want to use this book accept that someone close to you will die”. While I still want N. S. as I am a collector of occult texts. It is a shame that the above mentioned is a absolute to work in it making the nearly $2.500 price tag not really worth it. Again get charnel whispers its $20+ and well worth it. Here is a link to a chat on the subject of different Necromancy books.
I hope this helps. 