The only protection as a historian is to institute a process of research and writing that minimizes the possibility of error. And that I have tried to do aided by modern technology which enables me having long since moved beyond longhand to use a computer for both organizing and taking notes.
I am a morning writer I am writing at eight-thirty in longhand and I keep at it until twelve-thirty when I go for a swim. Then I come back have lunch and read in the afternoon until I take my walk for the next day's writing.
I write in longhand on yellow legal pads.
We have now sunk to a depth at which restatement of the obvious is the first duty of intelligent men.