To install an HP printer, start by unpacking it and placing it on a stable surface. Connect the power and, if needed, a USB cable. Power on the printer. Next, visit the official HP website, search for your printer model, and download the software for your operating system. Run the installer, follow on-screen prompts to connect the printer (Wi-Fi or USB), and complete the installation. Optionally, set the HP printer as the default. Finally, print a test page or document to ensure it's working correctly. Refer to the user manual or HP support for specific model variations or troubleshooting.