It's easy and only takes a few minutes, do it myself only. I take it out for longer trips then back in again when I'm home.
There will be a little more noise with it out, some foam sheet from Clark rubber on floor and rear wall will give you back the deadening.
The seat brackets are great for screwing in some heavy eyebolts to tie down anything else you may put in the space.
In Victoria no certificate needed for this, check the table here and keep a print out for when you are interstate:
https://www.vicroads.vic.gov.au/registr ... cing-seats