Last year we completed an interior refurbishment that included repainting the interior. We had some new paint tinted to match the existing dark grey so I can't share advice about changing the color, but I can say there was several days of preparation involved and a LOT of masking. Matt Dralle's RV6 project site was a great source of information
http://www.mattsrv6.com/MattsRV6
We also fitted new Classic Aero seats and armrests, custom made carpet, stick grips and lots of other details like powder coated canopy handle etc. We are really pleased with the result, it looks and smells like a new plane on the inside.