I am pretty sure it is removed in the same manner as this video shows.
http://www.youtube.com/watch?v=kM3dj1RDaow
Another video
http://www.youtube.com/watch?v=cMfrhqVfW8Q
Service manual does not show just the mirror glass replacement so I could not use it for reference.
HUMTECH may have more info on a "how to" if he sees this post.
Could not find a actual video for our H2's. Suggest that you move mirror to one side so you can see behind it to see if it is the same method. Also if you have heated mirrors use caution with the fluid inside the mirror cause it will damage the paint.
Good luck, Ed