Has anyone done this, and is it easy to do without damaging the bumper?

 

gravel trap?

 

replaced mine a while ago. there is two screws by wheel arch and another two underneath engine bay. then it just needs prising off the bonding on mine was really held tight but eventually came away. there is a good chance of scatching the bumper I suggest you put masking tape on before you start to protect it. getting the old bonding off is a pain its almost like rubber.
ken