Looking for help with de-DRMing an eBook from yuzu reader

Just bought an "enhanced eBook", accessible only through Yuzu (Barnes and Noble's site) and I would love to rip it to PDF and get it on libgen. Does anyone have any advice or tutorial for this?

I don't have much experience with writing scripts but I understand I could use python to screenshot and append all 800+ pages as well. Looking for how to do this if it's what I have to do.

Thanks, and happy to provide more relevant info if needed!