In the Jehovah's Witness "world-view", what is the difference between divinely inspired and spirit directed? Leaders and failed predictions?

I doubt that you will get a Jehovah's Witness to answer your question. They don't like to think about the many false prophesies that their organization has published.

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Divinely inspired. The Bible writers were inspired of God.

Spirit directed. It is very similar to what the Trinitarians call "indwelling of the holy spirit". Trinitarians believe that they have the holy spirit living in them. It guides them in their actions.

Jehovah's Witnesses believe that we are lead by God's holy spirit. The Bible tells us to ask for his holy spirit. It is our personal helper. It help us understand, remember and gives us strength. This is how we are directed by the holy spirit.

TTYN, LOL