The other night, after having modified my plate holder to fit the odd sized holography plates, I finally loaded a plate. It worked great! So an exposure is the next thing to do and then processing.

I'll try to provide pictures of the holder soon, and of course the plate once it is processed. I found the emulsion side by breathing on either side, as suggested by R Shaffer. The glass side will fog up while the emulsion side will not. I did all this under OC-safelight illumination, which shouldn't be a problem, considering the incredibly low sensitivity of the plates.