Done it loads of times. I can now do a room, return the hardware, and put on the first coat of varnish in a single day.
Here are my tips:
Don’t worry too much about nails unless they are really sticking up.
Go diagonally first with the roughest grade until the boards are flat. Then along the grain with finer and finer grade.
Go evenly. Cover the whole area before going back over a bit. And let the machine drop gently or you will be left with a nice groove.
It best to do the edges at the same time. If you leave the edges until last you will notice that the edge 6 inches are much higher than the rest. This makes it harder to do the edge. HOWEVER if there is only one of you I would not bother – leave all the edging to last.
Empty the bags before they get too full and you will not get too much dust in the air.
Don’t worry too much about all the bits you can’t do e.g. corners. Just try as best you can with a detail sander. When it is varnished and furnisher you will not notice.