I have searched and found tutorials of removing the rear trim panel where the rear speakers are. but nowhere did it answer this..

- For those who removed the panel, did you use a trim clip removal tool?

- If not, when pulling on the panel, did the panel attachment points (where the clips are) break?

- When reinstalling the panel, was it difficult to line the clips up into the holes?

 

1-No, did not use a removal tool, might need a knife or something to get the 1 clip out that is under the seat. But other than that just pull from the cup holder part and work your way around.
2-None of my clips broke
3-There was one that gave me trouble, it kept wanting to fall out when i would go to put it past the seat but other than that it is easy.

Not sure what DIY you found but this one is really good if you didn't see it.

https://www.scionlife.com/forums/tc-tech-diy-1818/interior-disassembly-24346/