It's a real snug fit, and for the age of your car, will require a little muscle.
The clips lift up by prying them with a flat screwdriver, but it will take a bit of effort to yank the assembly out.
Once the vent(s) are out, you will see the attached wire. You can gently pull the bulb housing out to reveal the very small vent bulb.
By the way, I haven't found replacements with the plastic covering around the bulb, so when I replaced mine, my vent dials light up like airport runway lights instead of emitting the original soft glow.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car