Yes, I like French locks...

But only at low prices, usually used, to that extent I'm an ebay addict...
Anyway, seb - with dismounting - do you mean: remove the lock from the door? That's probably very easy...
Or taking it apart, so that you can see inside the lock? I would not recommend that, if you want to use the lock afterwards. High risk of the lock failing at some later point in time, e.g. when you get home late and it's raining heavily and so on... Only take apart locks that you don't want to use afterwards.
The latter is described in these forums, however; search for "Euro re-pinning" or similar.
mh