Well i've bought a pair of Phoenix gold ZDST6CS "plug and play" speaker kit last week as a treat, very similar setup to the focal but slightly cheaper.
Removing the front door card wasn't so bad, watching tweetbean video on how to remove the door latch was a lot easier to follow than most of the guides people made from the states. Definitely require a bit of force to pull them off the clips, anyway got the front speakers installed without a problem.
The tweeters was a bit confusing as I got a bit confused with a lot of the information posted from what i've found in the past from youtube, FB group and the forums since a couple of them "show" how to connect the tweeter + 3.5-4" speaker as well, but the wiring pinout definitely helped found on the forum.
So I bought a CT55-TY02 which confused me the most but it made a lot more sense after seeing someone having to splice the 2 red wire and 2 black wire together, then you can just go pos to pos and then neg to neg into the adapter.
This adapter pretty much has the wiring correct out of the box, which I did not see at all until after i've done all the splicing and connecting:
Toyota 4 into 2 way terminal adapter
Got it all working now with the front speaker + tweeter together and my verdict so far they sound a lot clearer than the OEM speakers, a little bit louder at volume 2-5 which is what I normally listen at in a generic Eonon 10" android head unit, so overall i'm pretty happy with the setup so far.
I did also order a Nissen AC condenser in preparation to get my AC working before the summer.