Informed by instructions here: http://sirlagz.net/2012/08/09/how-to-use-the-raspberry-pi-as-a-wireless-access-pointrouter-part-1/
Edit ConfigureMe.sh to set important values, such as AP ssid, passphrase, and channel.
Make sure you're at a real Raspi terminal - ssh will be cut off by this, in theory.
sudo /path/to/raspiwap.sh.
ConfigureMe.sh should be kept in the same directory so the variables can be included.
Copies /etc/network/interfaces to /etc/network/interfaces.bk prior to changing things. To restore, rm /etc/network/interfaces and mv /etc/network/interfaces.bak /etc/network/interfaces