A newly diagnosed person should be told what is happening to them. They should be told that the situation is usually a life sentence without parole, but that the first 4 years are crucial, can make or break the situation. Therefore they should think of it as taking a vacation for 4 years, stopping literally everything. They should have no other responisbility than to let the disease have its way, to not interfere or fight it, to go with the flow and put all concerns on the backburner for awhile. To focus on rest, rest, rest.
I might not have done anything very differently, as I was a mother to a one year old, and not working. However, with knowledge and good advice I might have been wiser in my behavior. I remember being very stressed over whether I was contagious or not, for a very long time. Especially to my family. It was a waste of time, it is not contagious.