As Henro and Downsizingnow48 said, stockpile the topsoil off to the side to reinstate later.
Obvous problem is the section (house area) is sloped to take runoff AWAY from the house, so you must leave that area as is. So where exactly will the subsoil be going?
I think that your tractor will be to light to do more than scrape the topsoil off.
I would suggest using an earthworks contractor to do the main job(strip topsoil and shift subsoil) and use your tractor to do the top soil reinstatement.
What sort of subsoil do you have, volcanic ash, mudstone, clay?