Pretty easy to take the badges off.
First heat up the old badge with a hairdryer until it's nice and warm (this loosens the glue/tape on the back)
Then, take some fishing line and work your way behind the badge slowly working your way down until it's off. The use some Goof-Up or tar remover to take the excess tape off the body of the car.
Then wax the area.
If you do it this way, you don't destroy your old badge and it's easier then picking at it with your fingernail. :wink:
Good Luck!