Remove dashboard
Remove door panel inserts
Remove seats using special tools
Grab thingy.
I don’t think that is right.
I believe the steps are:
1) Bolt rear seat cushion to external rack.
2) Drop car to separate seat from base.
3) Turn car over 90 degrees and shake to dislodge items.
4) Turn car back to level
5) Raise car back to seat cushion
6) Remove external rack bolts
7) Jump up and down on seat to re-attach.