One of the rear doors doesn't always lock.  I've got another door lock assembly, and was thinking of swapping it this weekend, but was just wondering if there were any particular tips before I start?  Are they just "plug-and-play", or do I need to disconnect the battery first (or worse, even "code" the new one)?  2017 car with KESSY, if that makes a difference?  (And the door protectors).

Are there any videos on YouTube? I changed locks on the MK1 Fabia and the videos were a great help. My learning points were:

Needed a splined tool to unbolt the lock from the door.

Long torx driver to loosen the door handle and release the handle to lock fitting.

The lock comes out with the inner metal door panel.

Window glass has to be released from winder mechanism.

I had to drill rivets to remove the inner door panel, I hope yours is bolted.

Good luck