I don't think I know in huge detail, but I do think I'm pretty well informed and have tried to follow the news and look at a variety of different sources. Fom what I've read I believe it will be a disaster, and will compound the problems we were already facing from climate change, and now Covid.
I live in a leave voting area and I think people here generally have little clue. They really do think it's about getting our powers back from the nasty EU, making our own laws, freedom to choose what we do, what we import, how we manage our borders, spending all those billions on our own country, etc. I think the general feeling is that it might be a bit difficult for a few months while we get things sorted, but then it will start to get better. The sad thing is that Covid gives them a get out clause - it WOULD have been great if Covid hadn't happened, and if there's huge hardship, high prices, job losses, recession, etc, well everywhere else will be suffering economically from Covid, so there'll be a lot of reorganising of facts to show that our problems are all just Covid too. Boris will be replaced with someone else, so no mud can stick to the new PM. And so it goes on. We are in for a depressing future. I despair for young people, or anyone with the misfortune to be poor, disabled, in bad health, etc.