I've soaked many prewar cards in my time (T206's, T205's, Caramels, Goudeys, Strips, W514's, Playballs, post war, etc, etc. etc.) and I wholeheartedly agree with Frank's advice. Just from look of the scrapbook, this one looks real easy to do. Hey, some Net54 members are experts when it comes to earlobes, my gift is scrapbook telepathy
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The best advice I can give, is to not be in a big hurry when you soak them. Just take a deep breath, put them in the pan and walk away. With certain kinds of paper or glue, walking away can be dangerous, but on this one, I see no problem. Don't force the issue, let the water do the work and just repeat this mantra over and over.... water will not harm prewar cards....water will not harm prewar cards....water will not harm prewar cards......
My second advice (which would be the same one I would give to someone who owns an aquarium), is to always keep the water fresh. After awhile of soaking, the water starts to mix with the glue and it will kill a goldfish and on rare occasions it could cause some staining (on the cards, not the goldfish). Thus, don't reuse the same water to soak a different batch of cards. That's it!
Lovely Day...