Not hard at all, I have found a great youtube video that will help if you are using euro pallets it takes 10 minutes to take apart, if it is them other pallets it can take up to 30 minutes, I have got to the point where I just cut them and prize the middle nails up so it comes off, I loos about 2 inch doing it that way though.
youtube video here
this is not my video, I am just using it for a reference. :D
Awesome!! Thank you so much @artonmysleeve!! Now there are no excuses on my end!! Bookcases for all my books!! Yay!!