Newbie intro + a retread on soaking

[steve B]

I wouldn't soak them.

Some notebook inks can bleed into the card, leaving stains.

And many autographed ones will probably do the same and get blurry or worse.

If you MUST remove the autographed ones, instead of testing and soaking, I would try very limited water, maybe applied with a damp sponge from the back of the paper. Enough to get the paper and adhesive wet but not too much on the card itself.
It's a bit of a tedious process, and what's on the other side of the page will affect how or whether you can do it.

If there isn't much pate or glue, you could open the gap between the page and card and drip a couple drops in.
Which is still more tedious and a bit risky. as far as peels/creasing goes.

Since the notebook pages still look pretty good, they were probably decent quality paper that isn't having big acidity issues. So it's not damaging anything to leave them as they are.