It sounds like you've had some good advice on here. It's always nice to see another scouter convert over to hammocks.
I tried a small ground cover a couple of times, but it always seemed to blow around. Noo much hastle. I carry a small square (about 18 inches) of a closed cell pad for a place to put my feet when I get up. My shoes go on it at night.
I've been through some pretty good rain storms and I just button up my pack and put it underneith. It keeps it pretty dry (or I'll hang it on my ridgeline).
Like you, one of my biggest concerns when I began sleeping in a hammock when on scout trips was where to change with the boys around. I just drop one side of the tarp down low. All that is visible from the outside is the mid-calf down. That seems to work for me.