There is nothing I can do to influence the negotiations in leaving the European Union, so I'm not stressing too much. Currently, I'm financially better off because of the referendum result but I accept that may change. Most of the 'leavers' I have spoken to after the result have accepted there may be a 'price to pay'.
There is little to be gained in imposing trade tariffs so my guess is that after a period of grandstanding (mostly by the EU in an attempt to cement or paper over (depending on one's view of the future of the EU) the cracks created by the first large country to leave it's Union), there will be agreements in place that don't significantly damage the trade of the UK and the EU. Of course the finance markets will continue to be volatile but there always has been periods of volatility, so little change there. Facts will continue to be interpreted to support either side of the argument but as the years pass and decades pass, the UK's former membership of the Union will fade to a distant memory.