No mystery to it. Here is exactly what happens from the moment you call to the moment we hand the job back.
Boards, fasteners and subfloor are inspected and moisture readings taken. A floor that is cupping from humidity needs the cause fixed before any sanding is scheduled.
The space is sealed off, HVAC managed so finish fumes are not distributed through the building, and access controlled. In an occupied school this planning is most of the logistics.
For a recoat, screening with the appropriate abrasive. For a full refinish, successive sanding passes to bare wood, followed by repairs and acclimatisation of any replacement boards.
On a full sand, lines are laid out, taped and painted, and artwork reproduced, with dry time between colors. This step frequently governs the overall program.
Sealer then finish coats with abrasion between. Return to play waits on cure, not on dry-to-touch, and rushing it produces exactly the finish failures the job was meant to fix.
None of this is required — it just makes the visit quicker.