I've gotten through around half of it – the material itself is not extremely difficult, but it does take a long time to go line by line and see how exactly line

I've gotten through around half of it – the material itself is not extremely difficult, but it does take a long time to go line by line and see how exactly line `n` is equivalent to line `n-1` in the program transformations presented. Basic haskell knowledge is also a prerequisite, you will want to be following along and coding up the chapters as you read it. For when you end up reading it so that you are not pulling your hair out as to why the code isn't working: there is a code error in chapter 4.