Post-read:
This has very practical advice, and it makes making and breaking habits look extremely doable. Though I took an incredibly long time to finish this, I think it's totally worth the hype.

Just after...
My brother bought it for a friend, but it came in the "buy one get two" offer, which we didn't notice...oops (considering it came for a lesser price than the previous seller.)
And, so, I ended up reading it, considering everything is in shambles right now - basically, I'm unable to pick any other book.