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Ha I'm doing the same at the moment and have dug a trench with a big conduit for SWA and CAT6, nearly broke me doing that solo by hand over 15m...
Now need to do the holes into house and cables behind kitchen units (solid concrete floor in extension) and under the floorboard from kitchen to front of house for router one end and CU other end. Because we have a sanded og floorboards floor though I'm only lifting a couple and going crawling under the floor to do the run.
thankfully the joists run the direction i need to go in both rooms. and the points the cables will be coming into where i need them to go under the floors are in line with where I need them to come up under the stairs. still dreading trying to get the old boards up and doing it all though.