Hey! I'm in the exact situation! Old HDB, 3 room, very lived in so lots of stuff. I've begun packing the lesser reached for stuff into boxes and labeling them though. One of my friends who re-did her floor tiles told me the contractor just shifted their stuff from room to room as the reno progressed. But, I'm not sure if that's what all contractors do, and/or it's purely for flooring work only.
Interested to hear from others with experience!