Sometimes no matter how hard you try to go it alone, you come to the realisation you need help. Albeit you might feel like a failure for not being able to do a seemingly simple task, the truth is that an extra pair of hands or point of view will lead you to clarity. Or an assembled piece of furniture.
Even then, with two people, you come to the further realisation that a third person is needed. A medic. A "furniture medic" - words the customer service lady was delighted to repeat every chance she could. In this case, a rubber mallet might have helped but I'd rather someone else inflict the damage.
Two precious Sunday hours lost, only to discover a defect outside my control. Hours I could have spent making Sunday cake. Alas, not all is lost for tomorrow we shall have Monday cake.