But I look at it as a chance to make the story the best it can be. The story deserves publication but it won't stand a chance without good editing.
The big jobs like changing POV or shifting/adding/removing subplots or adding/removing characters take a lot of work. As I begin the major element revision, I keep notes on the other changes it will cause (maybe a particular scene will require a different approach, or a character will need more development, etc.) You really can't know if a major element revision will work until you try it. If you don't like it, you can always go back to the original. In my experience, though, once I saw it was a better approach, it really gave me the motivation to see that big change through to the end. Sometimes it even spurred brainstorming about other aspects of the story.
One caution when editing on the computer - save very often and back up each version on a flash drive/cd/separate computer - even consider keeping a daily version or at least a complete new version for major changes. You may decide as you're working your POV change that you want to go back to something you added, then took out days before. If you save, save, save and keep various revised versions you might be able to do that.
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