Old wood floor restoration Q's

[Weirdbutok]

I'm starting to restore our old wood floors in this 90-something-year-old house. If anyone could give me some advice I'd be really grateful

1. Replacing broken boards: No idea how to do this the right way. Is it something I should avoid completely and just leave it to an experienced builder? Or is it a reasonably straightforward job? One of the boards that's broken goes under the wall from one room to the other, how on earth does one replace that piece?

2. Knot voids: The floors have a few holes about the size of a 10p coin where there used to be a knot. What's the strongest way to fill these so they can cope with being walked on? Should I use epoxy mixed with sanding dust, or should I use wood filler?

3. Tung oil finish: With two of the rooms, I may not be able to oil the entire room in one go unless we hire a storage facility for the furniture, and pay for specialist piano storage too. Could I oil a large room in sections? Eg. moving furniture from the edge of the room to the middle, oiling that area, then when that's fully cured moving the furniture back and oiling the walking area? Is it likely to be noticeable in appearance later where there's a little bit of overlap in the oiling?

Thanks for any advice offered!

 

[Tigercubrider]

I have never done it but..
Are they t&g? Do you have a room /landing/hall that you can salvage old boards from so that varnished floors look matched? Then you can put newer boards in the non visible areas

Against the wall /under the wall you could cut the board and add a noggin to support the new board