did mine..poured hot water on the seal, then pry it open...sloowwlllyyyy...
then,remove as much old sealant and re-seal both after 'spraying ' the inside lamp..you get the idea.. good luck..
There's a guy in Shah Alam doing it for RM80....if ur interested look under marketplace exterior...he uses a heat gun to heat the seal of the lamp and then slowly open it up....
I did mine by melting it with boiling water, then prying it slowly. Be careful not to break any clips cos I did mine!make sure you reseal it properly and check for any leaking too!
this is aint a easy job... need a lil bit of DIY experience and delicate handling.. also you need experience to do paint job too.. to those who have zero DIY experience n never even attempt to change your tyre to spare tyre it is not recommended for you to try it out.. better send to paint shop before you screw it up...