Restoring an old farmhouse: Cleaning up the debris

The first step in the restoration of this house is to clean up all the debris, so we can later prop up the damaged structure of the building. This is a somewhat dangerous task and requires of special care and attention besides the mandatory helmet and gloves.
You need to examine all the floors, beams, walls to determine where it is safe to step on and where it is not. Then you have to mark the unsafe areas. Also you need to determine the likelihood of something collapsing on your head.
The debris come from the non-load bearing walls that have collapsed after the years. In addition, there're some roof tiles that fell from holes on the roof.