It sounds like you got bad info from B&N, although no help desk is going to tell you how to strip DRM.
As others have said, on B&N's web site go to My Nook -> My Library and click on the download button next to an ebook. B&N uses a different DRM scheme from most other ePub sellers, but it is just as circumventable. As usual, see Apprentice Alf for DRM issues.
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