Ehhh, on every E39 light i've seen it's just a matter of releasing the 5 brittle plastic clips and the lens pops right off. I'd be careful with them, you WILL break the top and bottom ones.
2011 535i xDrive M-Sport - 114k miles
2003 Land Rover Discovery 2 - needs a core support or a new owner (cheap)
2005 Dodge Ram 2500 - Cummins with a Bully Dog and some goodies