2010 Yaris Sedan Rear Speakers

[frankencar]

Okay, I've looked and looked but cannot find, so if you have the link to this information if it already exists, that would be awesome.

I'm trying to replace the rear speakers in my new 2010 Yaris Sedan, but I can't seem to get the grills to pop off. Further, as I looked under them while prying, it looks like I need to actually be able to get under that whole carpeted section in the very back, but for the life of me, I can't figure out how, nor can I find instructions online.

Please, if someone can give me some instructions or create a DIY, I would be very much obliged. Can't stand the poor quality of those paper speakers for much longer!

Thanks in advance!