Just make sure you've got someone to help you and make sure the lower front wing corners are protected with cardboard or some-such. Take a look here:
https://www.youtube.com/watch?v=7BUGH4_VMkU
... which should help. You CAN do the filter without taking the bumper off, but I think it is more difficult, unless you have the car up on ramps, maybe. You have to learn how to do it sooner or later anyway !
Tip 1. An old garden chair/lounger cushion is ideal to use to lay the bumper on, since they are about 5 foot long and nicely padded. The bumper will tend to rotate as you pull it forwards and off, so have it in place ready. (Don't use a new cushion; grounds for divorce).
Tip 2. You don't have to disconnect the wiring loom connector (which can be tricky); just swivel the bumper unit to the side on its garden-chair / lounger cushion.
David