You can check my blog over on frenchcarforum.co.uk, starting at this post:
https://www.frenchcarforum.co.uk/forum/ ... 71#p624171
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One mistake I made during my cell swap was to attempt the swap when the pack was at 20% SoC. I would recommend that you do the cell swap with all the (good) cells fully charged to 4.1 volts, and also charge the replacement cell to 4.1 volts before fitting using a Lithium Ion cell charger.
Please be extremely careful when jacking the car up to make sure it is stable and also working with the high voltages. Even with the link plug removed from the battery pack once the cover is off there is still a risk of electrocution if you touch between different parts of the pack that have have a potential difference of more than about 50 volts.