Do you just use a screwdriver while the emblem is on the car to pop the cover up and replace this or does the decal have to come off the car for the insert to be replaced?

How much are these?

Edit: oh wow just saw the price. Quite costly and seem like the silver material is painted with a paint brush instead of printed? Seems it would not look like the original. Can you post some pictures of the finished decal (close ups)?