As has been said already, the Pope is only infalliable when he speaks ex cathedra, and only on matters of faith and morals.
No such limitations abound by your appeal that you are infalliable in biblical interpretation by the Holy Spirit.
So you are more powerful than the Pope! No Pope has ever said, “we believe that these books are self-evidently not inspired, ergo we will take them out of the canon.”
Protestants don't claim that they themselves are infallible. They know that no man is infallible. However, they do often claim that the scriptures are infallible.
If you believe the Pope is infallible because he has the Holy Spirit, I would assume you would believe the same about the scriptures which are "God-breathed".