the only way around it would be if you could lift up the car? i used my bro-in-laws car shop to fix the mesh on my nismo but yes, it is highly recommended to install mesh with the bumper off

 

off topic, but any info on how to get the mesh on? i got a new bumpr and im gonna be getting to installing the mesh, it came with these long wire things and speaks of using epoxy, im not familiar with either.... help plz