Mine was done under dictée with the notaire dictating. I thought this is how it must feel in school or in the national dictée competitions I heard France had. 3 lines and done.
I needed to override French succession and notaire advised how then dictated.
150 euros to file (2013). Notaire had certain days when she went to the national registry and advised me when this was done. So I think it’s important to get the will “registered” officially. I suspect a holograph found under your bed might not be valid in France - whereas in UK if it was reasonably thought to be done by you and your last done one it would probably be accepted.