Setting up your HP printer via 123.hp.com/setup is a quick and straightforward process. Start by unboxing your printer, removing all packaging materials, and connecting it to a power source. Turn on the printer and install the ink cartridges, ensuring they are secure in place. Next, load paper into the input tray and align the cartridges if prompted. Once the hardware setup is complete, visit 123.hp.com/setup on your computer or mobile device. Enter your printer model, download the appropriate drivers, and follow the on-screen instructions to install the software.