Arrived in 3 cartons. Unpackaged with minimal effort. I managed to assemble the bed by myself with just a screwdriver in about an hour and a half, and I am NOT a handy person. (I believe my husband could have completed it ridiculously quickly with his power drill.) The most important thing is NOT to tighten all the screws prior to completion! Slats aligned properly with the pre-drilled holes. I am not sure why there are 12 slats but only 6 wood screws provided for each side rail - you are instructed to screw every other slat down. Middle support beam underneath does appear somewhat less sturdy than the rest of the bed but It is fine if you lift the bed up instead of dragging it across the room to place it. Pressure from above will keep the middle support in place, make sure the 4 legs are completely perpendicular to the floor and use the leveler feet if required!! I really love my new bed!!!!!!!!!!!