How do they get the 0-2 out?

[Thomas]

On the bottling line, a nitrogen (sometimes CO2 ) sparging system injects the nitro/CO2 and displaces the Oxygen.

In home winemaking you likely won't be able to do it and really don't need to do it. Your wine will not be around as long and will not travel as far as commercial products. Your oxygen control will be in the form of powdered or tablet form sufites.