Furniture injuries are mostly backs and fingers, and most of them are avoidable with technique and cheap equipment.
Load close to the body, knees bent, back straight, and no twisting while carrying weight.
Twisting under load is the specific movement that causes most back injuries, and it usually happens when somebody turns to see where they are going.
If it is too heavy, it is too heavy. Getting help is not a failure of technique.
Where items ship compressed or flat-packed, of the kind described at https://fdw.us.com/, the carton is far easier to move than the assembled item, which is an argument for assembling in the room where it will stand.
Small pads under each foot let one person push a wardrobe across a floor that two could barely drag.
They also protect the floor, which is the other half of the problem: dragged furniture scratches wood and tears vinyl.
Different types for carpet and hard floors.
The step people skip and then trip over. Doors wedged open, rugs rolled back, cables moved, and nothing on the floor.
Most furniture-moving injuries involve a trip rather than the weight itself.
Hands on the sides rather than the front and back edges, which is where they get crushed against a frame.
Communicate before moving, every time, rather than assuming.
Drawers left loaded strain a carcass and fly open on stairs.
And a plan for where to stop.
Not socks or sandals.
On stairs especially, so nobody holds a load waiting.
One person calls the moves, which prevents crushed fingers.
From hard-floor ones, and using the wrong type does nothing.
Which is where most drops happen.
Most dropped loads are a slipped hand rather than a failure of strength.