Depends which
badge you’re doing. Front
badge you have to unclip the old one, remove the chrome
badge completely and clip the new black one on. Rear
badge sticks over the top.
Since doing mine the front is still perfect, the rear came unstuck twice - so I dismantled the boot latch and had a local company paint it gloss black for me instead.
With hindsight - just use plastidip, would have saved me money and been a lot less hassle