That's a great question, and the answer depends heavily on the specific bench you've ordered. In most cases, outdoor benches are delivered with a significant amount of assembly required to keep them safe for shipping and to reduce costs. You can typically expect a "flat-pack" delivery.
Generally, the main wooden or metal seat slats and the frame components will be pre-cut and pre-drilled, but they will need to be put together. This process usually involves attaching the legs to the seat base and then securing the backrest to the main frame. You'll likely need to use the included hardware—such as bolts, screws, and washers—and a simple tool like an Allen key or a basic wrench.
The good news is that assembly is often straightforward. Most reputable manufacturers include clear, step-by-step instructions with diagrams. For a standard 4-6 foot bench, the entire process typically takes between 20 to 45 minutes for one or two people. It's a manageable DIY project that doesn't require advanced skills. Always check the product description before purchasing, as it should specify the assembly level, from "minimal" to "full assembly required."