I don't think Nook supports 'input' via the HDMI cable. However, you'll have to see what people with actual experience trying that say.
There does not appear to be a good way of getting material from a normal SD card onto the NHD+.
Yes, there's no easy way.
What you can do, is, to use a microSD card with a microSD to SD converter in your camera. Then the microSD card you can plug in.
Of course, you might prefer SD cards for some reason - in which case I don't know what the solution is.
You could use a micro SD card in your camera and insert the card into your NHD+ to view the photos.
Thanks. Unfortunately, my camera does not accept a micro sd card. I did, however, find a converter online.