I have just done this, but on the right hand side.
Was pretty straight forward - just need to take your time and not force anything
Here is how I did it... I only have photos of the back sides of the panels - so I knew where the clip were for future reference.
Remove the threshold cover - it just pulls off - no clips to break
Remove black floor trim - this makes it easier to remove/replace the wheel well trim - at least on the right hand side.
Remove wheel well trim - I don't have pictures but plenty about on the forum with instructions how.
Basically remove the three black nut covers. Remove nuts and slowly pull the trim off.
Lots of clips to break
The next 3 panels are the ones you were asking for...
Remove seat back bracket cover (1)
Pretty easy - pulls off, no breakable clips
Remove top piece (2) with seatbelt coming out of it
This will require undoing the seatbelt anchor bolt in panel (3)m under a rubber cover if you want to remove it completely
I found a ring spanner worked just fine on this bolt - no room for a socket. It has blue loctite on the thread.
Bottom clips first, as the top has tabs the sit under the head lining which you will have to slide out.
The next panel (3) has to be remove carefully on the right hand side as there are locating pins and all the wiring runs down this side for rear nato etc.
It may be easier if the seats were removed - but i wasn't going there - so I just had the seat base removed with the seat back folded down.
Remove the bolt that screws into the floor (red circle) - guessing at 10mm socket - has blue loctite
Remove the chrome tie down bracket (red circle)
Unclip - not many clips to break.
Again - long locating pins (blue circles) to deal with and some wiring, relays, plugs, etc to navigate as you attempt to get it out from beside the seat.
Putting it back is obviously just the reverse - the pictures make it easy to know where the clips are to locate/push home.