It is certainly easier to install the back splash guard with the fender off but putting the fender back on can be a problem when you try to get the rubber seal to bend forward instead of backwards or simply kinking up against the fender. I tried this and it worked great. Just a little masking tape to pull the rubber forward and after the fender was on I just reached up underneath and pulled off the tape. A lot easier than sticking your hand up under there and trying to pull the rubber forward as you are putting the fender on.

 

Great idea! That is one of my jobs over Thanksgiving.