While it is NOT necessary to remove any panels to access the light sockets, it IS necessary to remove the rear and DS panels to access the top pump reservoir, and necessary to remove the rear an PS panels to access the locking pump.

The plastic fasteners are NOT one time use as Max previously stated ( and now knows ).

A special tool is not required, a simple screw driver to barely lift the center part, then a pair of wire cutters to extract it further ( NOT TO CUT IT ! ) works just fine.

It is usually possible to remove the fastener and the retainer piece together, but no problem if you completely remove the retainer before removing the fastener.
The two go back together easily enough.