To answer the original question, what would you do if you though you might be infected with the coronavirus? I would likely self-quarantine. I can work from home easy enough. I would also try to think where I might have contracted it and who I was around the previous few days and warn them to keep an eye on their own symptoms. Regarding going to the doctor, getting tested, etc. The test kits are still in very limited supply. I would probably try to call a doctor on the phone to discuss symptoms I might already have and then let him/her decide what to do next.
The tough thing is we're still in cold and flu season. So it would be pretty easy for anyone coming down with a common cold or the flu to wonder if they're developing the COVID-19 respiratory illness. I've had the flu enough times to know I'm coming down with it; every time it has hit pretty fast. I wouldn't be out and about doing normal daily routine stuff while infected with the flu. I'd feel too bad; I'd usually be at home in bed resting and getting over it. I think the common cold is the more dangerous factor in that someone with minor COVID-19 symptoms may only think he has a cold and decides to keep doing business as usual (go to work, go to the store, etc). I would want to know if there are any unique symptoms with COVID-19 infection that you don't normally see with a cold.
I don't think very many people are prepared to bunker up at home for 2 weeks. I have more than enough soap, toilet paper, rubbing alcohol, hydrogen peroxide and other cleaners to last that long. But food is another issue. I buy a lot of green produce and that doesn't last very long.