Try getting someone to activate the washers then grab the jet gently with a grip when it pops up, its only powered by water pressure and spring loaded return. You will see the the washer cover has two u shaped retainers that unclip from the the diamond shaped retaining clip. Be careful as they are easy to damage the retainers and remember that they are handed left/right so need to go back on the same side. Replacement is a reverse process.
Bumper off isn't a huge process 10-15 mins once you know where the clips and screws are, there are lots of threads on here if you go down that road.