Measuring all of the above.
Suggesting what could be disposed of, what could go into long term storage, and what we need to keep regular staff access to.
Working out the entire floorspace taken up by all of that, both on display and in storage.
Measuring some items again, as they lean against a wall, so their footprint is actually greater than their width.
Figuring out how that floorspace breaks down in terms of long term storage/regular access needed.
Planning the man hours, skills and resources needed to relocate things.
Moving to drinking coffee...