In all the talk of graphical downgrades no one seems much preoccupied with 'why?'. Why build something and then proceed to tear it down, piece by piece, in the hope that ever more diminished expectations about the final product won't be severe enough to...
Don't always go for the obvious colour. Sometimes, it's better to think first.
Take as much time as you want - there's no limit.
Look for squares on their own, for these are the toughest to clear and should be a priority.