Front speakers will be removed without the removal of wood trim. Just look carefully and you will see the top 2 screws.
There is a 'factory' connector about 6-8" from the speaker that you can disconnect and take the speaker away.
I suggest that, if you are replacing the original speakers, you take care to desolder the wire from the original speakers and use this on the replacement items.
From my vague recollection, one needs to remove the parcel shelf in order to remove the rear speakers.
In my case, I went for a newer design, larger speaker and separate tweeter unit. This necessitated the purchase of a mounting board, premade and precut oval shaped box, that accomodated the new 7" speaker and the tweeter. It was covered in vynyl and I painted it to match the colour of the carpet on the parcel shelf.
Do this gave me clearance to place the larger speaker in the rear without cutting into the bodywork.
Enjoy!