i assume for both you mean slicing winds ,
For a power large slice of wind, i would first change my chakra nature to Futon, then i would have to grind my chakra together not to precisely as i would if it were a thin slice of wind that has better cutting properties, but i would have to grind it so the outcome (that resembles a blade as you say) is larger then that of the thin slices, So most likely i would need to grind longer and harder, then i transfer it to my throat and release the large slice of wind from my mouth,
For a thin slice, again i would change my chakra nature to that of Futon, then i much more precisely then before grind it into a smaller but sharper blade ..once that is done i transfer it too my throat and spew out a slice of wind that perfectly cuts through all in its path