Put te thabletop on a clean surface like a clean carpet or a big cardboard. Check twice if there is nothing that can mark the tabletop.
Position the leg with the round corners into the edge of the table. Position the four screws manually, then tighten the screw with the given tool starting by the bottom.
Find the two strongest people in the room. Slowly tilt the table on its longer edge. Then lift it up and flip it. Avoid to lean on the two legs.
Place the metallic bonnets on the magnetized legs. Magic, isn't it?