I did mine about six months ago, what I did was remove the side grills and then push the badges out from the inside.
I put pressure on the dowl's that are on the badges because my badges had a lot of double sided weather stripping holding the badge to the grill's.
Once I had made room under the badges I used plastic prying tools and a glue dissolver called "OFF" to help loosen the weather stripping.
Then you mount the new badges and put the assembly back on the car "Voila" !!