You Receive Your Manuscript Back With Lots of Edits . . .Now What?

So I received my manuscript back yesterday and I'm excited and eager.  Excited to get someone else's feedback-someone I respect as an author.  Eager to dive back into the world of Alex and Hayden.  I've missed them while they've been gone.  Desperately.  

So, right now, I'm in the process of welcoming them back with open arms:-)

Upon reviewing Stephanie's notes, I have a lot to consider.  She sent me three pages of amazing comments and a completely marked up manuscript.  She did exactly what I wanted.  She offered suggestions, told me where things took her out of a moment, told me when things didn't add up, told me when things were too hard to believe, etc. Her comments totally refreshed me, and hopefully my story.

I've been working on my revisions.  Her notes are marked up with post it notes of ideas I had based on her thoughts, and I already eliminated pages from the manuscript based on her suggestions.  I'm down 20 pages, but she did recommend cutting it down 50-70 pages. I would love to do it if I knew where to even begin cutting.  I knew it was long(420 pages).  But I'll have to ask her more about that when we have our phone conversation.  

The great thing about Stephanie Elliot is she is completely open to me asking questions and running ideas by her.  Thank God, because I want to be sure my revisions are not ruining the story.