Comment by OutOfHere
It was the OP's choice and mistake to buy a complex design that was difficult to self-assemble. Any number of simple metal bed frames bought online can trivially be assembled by a single person. Never give up your power unnecessarily.
What if they have a physical disability or affect like they're pregnant or recovering from surgery?
What if instead of a simple furniture item it's a piano. Nobody can have pianos anymore unless they move them on their own?