Rear 1/4 Interior Trim

[utey]

Just got some interior trim for the rear of a station sedan.
Its in 2 pieces the larger piece is obvious how to fit but the smaller section that curves and is removed to replace the lights  is not as obvious. Does this slot in behind the larger piece ?
The smaller piece is too large and needs to be cut to fit making it even harder!
Any help and pictures would be a great help.

Nick