HOA start up via YouTube
Don't forget, you can start up your Hangouts on Air (HOA) from the YouTube Live Streaming area (Used to be called Live Events).
Go there and ignore all the push to get you to use "Stream Now (Beta)" and go to the line below it called Events.
That is where you can set up and eventually start up your HOA Broadcasts from the YouTube Interface (be sure to choose the Quick Type of broadcast to use your familiar HOA).
Here is a link to how YouTube suggests we promote our HOA Broadcasts that are started this way.