woodsmith
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I did one of these last year and the nails had all rusted into the joists. I just tore up the boards then cut off the nails that I couldn't pull out with an angle grinder. You need to be careful not to set the house on fire though.
The main problem comes at the walls, if they are stud partitions they are often fitted on top of the flooring and so it is easier to cut the flooring back to the last joist before the wall.
Places where the boards end up with little support can be strengthened by screwing and gluing plywood underneath.
That said you may be better off just patch repairing where the floor has gone soft, that is what I would look to do.
Plus screw rather than nail the new flooring.
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