Extremely easy to assemble. Very happy using it for a twin size bed. Out of curiosity I tested it with a full size mattress set  it did hold up but I think it would need an additional center support bar if 2 people, or 1 extra large person were sleeping on it   I think a queen size bed would definitely need the extra center support bar. But again, I’m very happy, so far, using it for a twin size bed.