Revisions, revisions, revisions................

Hi All, I'm coming out of the revisions cave to say hello.

While I was at RWA, my editor sent me revisions. They included a 7-page revisions letter and just about one content note on every page. Eek! Deadline: 3 weeks. So I've gone directly from an incredibly intense, busy conference into heavy revisions and I have hardly come up for air.

So I have a revisions question for those of you who are writers:
How do you know when you're revising that you're not making the book worse rather than better? I think that's my biggest fear!