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I'm expecting it to be pretty darn flat
The issue is not with how it's laid, but with how accurately the boards have their tongue and grooves machined. If the boards are from separate batches, small differences in tongue and groove heights can produce a lip on the edge of boards. Fortunately with pine, it shouldn't be too tricky to sand flat.
Definitely do this.
Think professional hitman (or woman).
You want the dividers between any areas you're not sanding to have plastic sheeting curtains - if it's a staircase do the top and bottom.