help with clio 2014 door latch not working

Hi Folks

Looking for some help with my 2014 Clio offside/right rear door latch which is not holding when I close the door. I have bought a replacement lock mechanism and hoped to find a guide to replacing it online, however I cant seem to find one.
Any tips or suggestions, or even better guides, on this before I get stuck in? Any comments on how easy/difficult would be appreciated.

Thanks in advance.

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