Reddit reviews I, Vampire: The Confessions of a Vampire - His Life, His Loves, His Strangest Desires ...
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In the excellent novel I Vampire the protagonist is also in a position in which he has to figure things out himself.
He ends up burning himself and learning about sunlight. The same should work for PCs. Finding out sunlight burns you is the “come to Jesus” moment of realizing you are a vampire. I would encourage you to play it up with their group.