Some little issues gettting create-react-native-app to work.
First, there are big problemos with NPM 5, apparently.
It seems like they're mostly to do with Windows but I take no chances and roll back to version 4.
https://github.com/expo/expo/issues/297 Then this,
which is to do with 'inotify watches' but I don't know what they are yet, so I just punched in the fix like an 80's kid with a copy of Sinclair Weekly.
Both of these issues were flagged by the installer/packager itself and all I had to do was read the error messages.
I inadvertently seemed to start 'Expo' from inside Simulator. Tomorrow, I will try again and figure this out for reals.