Originally Posted by
Captain Morgan
I recall the book versions spending months in the wilderness. Did that not happen in the movies?
I was going to point out that the Potterverse has an entire school of magic devoted to shielding the mind, but only. Harry was specifically trained in it AFAIK and I don't think he was very good it. That said, given time to study and books to study for it, there's little doubt in my mind Hermione could learn said school or otherwise come up with something to insulate the ring. Extra dimensional storage space, for example. But the kids pretty nerfed here.
That being said, if they do succumb to the ring, they should rather easily be able to murder the Fellowship sans Gandalf rather trivially, and I'm not even sure if Gandalf can take them. HP magic is stupid versatile.