I read some historical Jesus book recently. It said he would have had access to only a small amount of material in the OT. Basically, the Torah, the Psalms, and the major Prophets. It makes sense. I can't recall the details. Perhaps it was the book that Borg and N.T. Wright wrote. Paul's genuine letters always reference some dispute about his authority.
The WTs are self-validating. I don't understand why people are so gullible.