Sounds like you are already comfortable with the basics since the two books you mentioned already reading are critical in my opinion.
Take your time and if this is actually "a good fit" you will come to that conclusion on your own.
If not, if something doesn't feel right or is troublesome to you, then it still sounds to me that you have your head screwed on right anyway whether you choose to become a member or not.
There is no rush and no one here will (or should) try to tell you what to do.
My best wishes to you in any case.