Problem is.
Free movement of people:-
I am biased as during the great financial crisis of 2008 I found myself with no contract and almost no new contracts coming up in the UK.Got a call about a role in Amsterdam on a Monday, phone interview on the Tuesday flew out for a face to face interview on the Thursday and started work the Monday following. All nice and easy, with no freedom of movement I would have been stuffed.
Tariffs:-
Are not the worst hing in the world, the thing is we also have a customs union this is why we can't currently have a free trade agreement with countries outside the EU. A simple example is garlic, Garlic from outside the EU is subject to a 9.6% import duty, so if I import garlic into the UK I can export it to the rest of the EU with a minimal amount of paperwork. Norway has a free trade deal with the EU, however its import duty for garlic is 0% so if you want to export garlic from Norway to the EU there is far more paperwork involved as the duty depends on where the garlic originated. If you grow garlic for export the duty is 0% if you import form outside the EU and reexport then the duty is 9.6%.
Generally I will be okay as either it will all be great beer will be a pound a pint and everyone will own a British made car. Or it will go to shit at which point I will hopefully have finished my Master degree so will qualifier for either an EU blue Card/Emigration to New Zealand/Australia/Canada.