Here are some videos that will walk you step by step as how to use the Google Plus hangouts feature.
In this playlist of Google + Hangout videos you will see...
How to Start a Hangout,
How to Start a Hangout on an Individual G+ Thread,
How to Get To and Use The Screen Sharing Option in a Hangout,
and How To Start a G+ hangout From a YouTube Video Page.
As you can guess, Google Plus members are really starting to see the advantages of using the hangouts. Being able to just invite your friends to have a video chat is just one fun thing you can do...some of us are using Hangouts to discus business, blogging ideas, and even talking about ideas for new sites. There is no end to what you can use the video conferencing for.