Having correct light is crucial, be wary of the eye strain. I found that I could only productively puzzle during certain times of the day with good sunlight. Those long sessions during the night were really bad for my eye sight.
Did a 5000 piece once. The mini dopamine hit when you click a piece into place is what kept me going. Several strategies used to complete it, in the end it was just trial and error because everything looked the same. Make sure to have good lighting (no glare) or you'll ruin your eye sight.
What people may not realize also is that at this "scale", it can happen that a piece perfectly fits in more than one location. And I don't mean a couple of cm apart, complete opposite sides of the puzzle. Fun times figuring this out.
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