^When troubleshooting something that's not working, or fixing
   something that's not going your way, do all that you can do,
   plan your next steps as far as you can, then STOP. And go do
   something else.

   Then, after a time, go back to it. The reason so many people
   bang their heads against the wall is they forget to take a
   breather for an hour or two. Do something mindless. Stop
   thinking obsessively about it and get your mind onto something
   else.

   This gives you perspective, backs you out of the narrow tunnel
   you found yourself in and sometimes the RIGHT tunnel is not so
   far away. But it would have remained inaccessible if you DIDN'T
   stop and do something else for a short time, before returning to
   the thing at hand.

   A P.S.: This move is potentially dangerous, as it annoys people
   around you that don't understand what you're doing. Also, you
   mustn't wait TOO long or else you'll forget some valuable
   details.^