i found it quite easy to do, but i'v done it about 20 times in the past motnh so i'm getting good at it:)
oh and removing the bumper wont really help you, as the plastic part of the bumper is held on to the inner core by these expandable pins that are hidden beneath the trim. it shouldn't be that hard to remove the bumper trim tho, go buy a set of hmm they kinda look like screwdrivers but they have picks ont he end instead of bits, and just be gentle and you should be able to undo it all fairly easy.