Cherbourg in the dark is not too much of a problem as long as you ensure to leave the red buoys to port - others on here have overlooked this to their cost.

also, golden rule is to keep uptide of the uptide entrance, ie to the east of the east entrance. If you miss it, at least you have a mile of spare room to the other one!

Its very neapy at present, so not such a major issue.

Hope it all works out well for you and will look forward to seeing you there.