Heater blower on 2016 453 has mouse nest ! SOS — How can you access area ?

Can anyone please advise on how to properly access the heater blower of a 2016 453 Prime to clean out a mouse nest ? I see a plastic panel that might snap out on drivers side, but fear it’s not the right thing to do (?) For about an hour of sweat n intense poking, my tiny landlady friend was scrunched up on passenger side floor trying to loosen up debris w/ a tiny brush n vacuumed up thru the screened area. She noted a couple screws there, so might that be another possible access area (?) I’m too tall to do that n my back was breaking watching her..oh the humanity ..ha.