As a professional organizer I think you've already gotten several good leads and hope you've found someone to work with. In case you haven't, I wanted to add a little more detail, hoping this is helpful to you and anyone else following this thread.
There is a local chapter of the National Association of Professional Organizers in New England. You can find them at www.napo-organizers.com They have a referral section on the site.
Also, the national organization has a section where you can find organizers more directly by writing in specific criteria (e.g. location, type of projects you need done, etc.) and you'll get a list of organizers with contact information, and you can contact them directly through the web site. www.napo.net