
You open the box and the first thing you see is the instruction manual, not the screws. That is the trap. Assembly kits arrive loose in cardboard, often dropped by the delivery van before it even reaches your 4-room BTO. I have seen buyers strip the Allen key on the first bolt because the packaging was already crushed. Check the hardware bag against the diagram before you touch a single piece of timber. If a screw looks different, it belongs to the wrong model. This happens more often than you think, lah.
Queen frames weigh more than you think. 152cm by 190cm is a lot of steel or wood to lift. Many packages come in two heavy boxes. If you open one and find the legs missing, you cannot start. This is when the warranty claim starts, not the assembly. Verify the leg brackets are there. Verify the centre support beam is included. A Queen needs that support to stop the mattress from sagging in the middle. If the beam is missing, the bed will creak one day.
Some sellers count screws individually while others use bags for groups. If you see a bag marked M4, open it. Do not assume it fits the M6 hole. Wrong thread means stripped wood. You can fix this later, but it is a hassle. Wait until you have all the parts laid out on the floor. Then you know exactly what is missing before the dust settles. Got the right tools? Grab them first. Do not force the screw or it will break.