Cupboards doorways closets and any other areas or items where you are working should be protected from dust with plastic.
How to sand wood floors youtube.
Sanding the floor will kick up a lot of dust so protect light fixtures and tape over electrical outlets.
Before you start sanding remove everything from the room and vacuum the floor.
Then sand the entire area at the same angle moving constantly as you work.
Hardwood floor sanding diy instructions.
Remove wall hangings light fixtures window coverings and anything else in the area that could be dirtied or damaged by your work.
To sand hardwood floors start by renting a drum sander and installing a coarse grit sandpaper onto the sander which will remove any noticeable damage or old finish from your floors.
Find the detailed instructions on sanding and refinishing hardwood flooring here.