That is exciting!! But you are not done yet
Did you get gsc installed yet? My instructions in there work pretty well. It is very useful for getting the simulators running.
Astrometry.net? I didn't write any instructions for that, but if you install it from home-brew, and put the index files in ~/Library/Application Support/Astrometry and then edit the config file in /usr/local/Cellar/astrometry-net/0.67_2/etc to reflect that path for the index files, and finally set the paths correctly in KStars, it should work.
XPlanet? I just followed the directions on the website and it worked. But, I don't really know what it does. I see that it has the ability to put what is on kstars on my background for my desktop, but that is really all I have seen with it installed. Might be useful or not, I really cannot tell.
And one other issue is the new stuff downloader. I was working on this problem last week. I got it working in the emerge version, but I'm not sure about the other yet. There are two environment variables that I determined need to be set properly (exported) before running kstars and then magically it worked. In the emerge version those were:
export PATH=~/kf/bin
export QT_PLUGIN_PATH=~/kf/lib/plugins