book of satoshi and grokking bitcoin really help give you a knowledge base for #5

you don't need to understand everything by reading #5, you can pick up a lot by just passively reading it without understanding the logic fully. #5 is the soonest you can read it and appreciate some of it's nuances in my opinion, you can always push it further out or revisit it

But how do the first 4 books prepare you to read the 5th?

premitive1

it doesn't, instead it lays the ground work for the economic engine behind the technical stuff. ie "MACRO"