I work in museums. If you are picking up something by yourself that is more than 25-30 pounds, less depending on size, you are likely to break it or yourself. Knowing how to lift and knowing when to get help is far more important. And when a ladder is involved... SighI work in museums. If you are picking up something by yourself that is more than 25-30 pounds, less depending on size, you are likely to break it or yourself. Knowing how to lift and knowing when to get help is far more important. And when a ladder is involved... Sigh