This doesn't mean it's impossible, it just means it takes a long time, and if we're going to go for No Deal it's incumbent on us to have some idea of where we will be getting our goods in between losing trade from Europe and building new trade deals in the future. One of the many, many things you never hear about.
And then there's the massive slew of regulations that need to be replaced. Again, not impossible - but guaranteed to cause hardship and serious problems. It does nobody any good to deny that these problems exist. And it's something that, frankly, we should have started thinking about 18 months ago, if not before.