No worries, Licq.
The only problem with giving the advice before the actual photo's is that the cable colours may be different ?? If one extension is run via drop-wire, it would be connected on the Orange/White, if it's the later version of 4-wire being used as for the extension, it would be connected to the Blue/Orange.
Also, we have to consider if the occupier (or a previous one for that matter), has/d a second line installed, and if so is the circuit being worked on in the here and now actually connected to the second 'pairs' within the cable ?? Again, that opens up a whole new challenge regarding which colours to connect.
As always, I'm trying to quickly cover
most scenario's not just our OP's, as we have lots of 'onlookers' who need to be in possession of the full picture before 'dabbling'.
As you have said, Licq ....... pictures will be the best way forward to remove any element of doubt, or potential problems.