bulb replacement
 

What's the best or easiest access to replace a burnt tail light bulb.

I don't have time to look up your car right now but on an '07 remove the single screw holding the tail light lens. It is at the very top of the tail light and somewhat hidden if you don't look up inside the top of the cavity where the lens is recessed. Then pull out the tail light assembly from the top outward. You will see a connector on the rear of the housing which twists off. Pull out the burnt bulb. Not very hard.

Its the same on any year C6.

And be very careful not to push the speed nut off when you replace the taillight...if it falls back behind the fascia, it can be a bear to find.

Thank you all for the help. I didn't realize the screw was there. I tried accessing from the trunk but couldn't see how that was possible. Really appreciate it.