Floor mat removal procedure for sound insulation installion?

I did this a couple of weeks ago.
What did you do to ur Gen III Prius today???? | Page 553 | PriusChat

I think you'll get a better return on your effort if you start with soundproofing the doors.

Also, take a look at @scrappy's reply to my floor treatment post.
What did you do to ur Gen III Prius today???? | Page 555 | PriusChat

 

The only thing holding the front seats in are four bolts and a few electrical connectors each. Those come out fast.

The rear seat is held in with twp bayonet clips and two hooks. You just need to yank it out -- but the two forward clips can break. It seems like a good idea to have some spares on hand. I just bought four (part number 72693-12080) from ToyotaPartsDeal.com for $22.

The center console took a while to figure out where all the bolts were. The trick -- look under the mats in the storage compartment floors.

The carpet is held in place with a few plastic friction pins. But mostly there are the hooks around the perimeter. It's not hard, but a little tedious. You need to pull up all of the plastic rocker panel covers, and the forward kick panels. There are pink clips through which all of the wiring harnesses are routed. These pink clips also serve double duty as carpet retainer clips. Initially it's a little tricky figuring out how to unhook the carpet. But it goes easy once you figure it out.

 

Tip: Go to AliExpress.com - Online Shopping for Popular Electronics, Fashion, Home & Garden, Toys & Sports, Automobiles and More. and do a search for the Toyota part numbers for things such as plastic clips.

Way cheaper than Toyota, and you can build up a collection of clips in anticipation of breaking the original ones when accessing the hybrid battery, etc.