-How do I install this? 

Drag the Liveries folder over to "C:\Users\(Username)\Saved Games\DCS\" folder and overwrite it.

-How do I uninstall this? 

Delete the "Cockpit_MiG-29A/G/S" inside of your ""C:\Users\(Username)\Saved Games\DCS\Liveries" folder

Enjoy and please provide feedback! 

