Delt call me if you want but it's more involved then most.
Open the backbox door
on the right side remove the black plastic strip (should be a few screws in it)
Slide the inner backglass out
now you have access to the outer backglass
At the bottom of the frame there aare two holes, remove those screws and take the piece of wood out.
You, if I recall correctly, will also have to remove 2 metal brackets on the left or right side (right side is easier)
You should now be able to remove the glass!

I am doing this from memory as my BH is in Pittsburgh so others please chime in if I am missing anything!

whenever

If I am recalling correctly there are two screws that you use a 1/4 nut driver to remove and the brackets come out.

Also, again doing it from memory, I recall pushing on the backglass towards the back while sliding it will clear those brackets. Those brackets will stop the glass from sliding but a little push while sliding will clear them, unless your brackets are bent (common).

Take a pic of your glass/brackets ... I don't recall needing an angle screwdriver.

Remove the below brackets! There are two on each side. Then the wooden fram comes out. If you havent done so already disconnect the wires for the lights. There is a connector just inside the back box. There will be plastic wire clamp with a screw in it as well that you'll need to remove.

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No problem! Clean your glasses really good as it’s not like you want to do this again anytime soon.