HI! how to remove my headlights please help

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i just upgrede my car headlights for a better look ,but i have no idea how to take the stock headlights set off.... and what kind of tools do i need to do the job.....thanks guys for any help out my car :2000 mercedes e320 and also someone told me that i have to disassemble the front bumper...its that true?? cuz im afraid to hit or touch the airbag sensors..... have a naice day :)