Read it for fun. Don’t take notes. Just enjoy the humour and the flashes of insight that will stay with you forever. That said, it is probably most useful for intermediate learners.
I tried to read it as a beginner, but at that stage much of it went over my head. I came back to it later as an intermediate learner, and at that stage I got much more out of it. I have the 1998 paperback edition.
There is a wonderful chapter called “The Johnny Carson Hodo”, which you may not appreciate unless you’re old enough to remember the Johnny Carson show. If you struggled with hodo sentences before, this will finally make them clear to you. There’s also a memorable explanation of the suffering passive.
The chapter on Wa and Ga is worth reading at any level. (It’s very early in the book, right after “The Myth of the Subjectless Sentence”). You will laugh out loud, and you will never confuse wa and ga again.