The division of Canaan

In Numbers, chapter 33:50-56, while they were in the plains of Moab, before they attacked Canaan and the west bank of the Jordan, Yahweh via Moses told them what to do when they entered Canaan.  They had to drive out all the inhabitants of the land.  They had to destroy all their figured stones, all their molten images, and all their high places.  When they finally took possession of the Promised land, they would divide the land by lot according to their ancestral family size.  If they did not drive out the inhabitants then those who remained would be like barbs in their eyes and thorns in their sides.  They would have trouble wherever they were settling.  If they did not do this, Yahweh would turn on them. How would you divide land?