The best way is always to stop when you are going good and when you
know what will happen next. If you do that every day ... you will
never be stuck. Always stop while you are going good and don't
think about it or worry about it until you start to write the next
day. That way your subconscious will work on it all the time. But
if you think about it consciously or worry about it you will kill
it and your brain will be tired before you start.
I used a variant to this approach (before I had heard of
Hemingway's connection to it) when I was studying printmaking
(among a lot of other things) in college: I always had multiple
images I was working on developing at any given time - so that even
if I finished something, decided it was complete and ready to be
editioned, I always had something else in-process to continue
working on. If I did get stuck on working on one image there was
always another one in-process to work on instead. I also always had
something at least mid-way toward a finished state so it was never
a rush to have something for a class critique - as often as not I
had something finished and ready to print an edition.
