This is where contacting a Strategist to look over the feedback you have received can be key in moving you forward in a way that works. Often after receieving signficant feedback the student will feel overwhelmed not knowing where to start back up. Do you start at the beginning? Or do you select a key portion to concentrate on? Talking to someone who has dealt with 100s of problematic dissertation situations can be incredibly helpful.
At the very least make sure you have a specific goal in mind when starting the editing process. Without having a defined goal for the editing - the editor will find the lack direction leads to a far less effective edit.