Same as any other day, work, eat, sleep etc. Will not affect me much.
Now a lot of friends and coworkers who work in Austria and other EU locales will be screwed. Austria is being pretty generous with grandfathering in long term UK workers. Other countries are not. I think I saw this play out in a movie with a similar theme. The movie was about Indian independence and the partitioning of the Sub Continent. The disruptions are still be felt to this day
“Better a true enemy than a false friend.”