No peanuts, bed of closed cel foam, sides same, 1" thick foam, foam insert in large pot and foam spacers hot glued to secure small pots from moving at all, then topped with another sheet of 1" foam.
Crazy attention to detail.
I love ginko too, but after seeing pix of most of the trees there were plenty of better deciduous trees, like the clump style JM or the Informal upright Korean hornbeam, IMO.
Agreed, if brown and withered not providing the tree with anything, I also have heard the leaves remain in place to protect new buds, definitely wouldn't pull the leaves, could damage buds, if they bother you, best to cut as dbonsaiw said.
If you put your location and climate info in your profile you will get better and more appropriate advice.
Most folks will say Chinese Elm should be grown outside, myself included, however some people are successful growing them indoors.
No reason not to trim if it is actively growing.
No juniper should be kept indoors, not surprising that it's dry.
Completely submerge the entire pot until no more bubbles arise, then keep outside and it should absorb water fine.
If necessary repot at the appropriate time, ie springtime