Three out of four of the assembly methods included in this guide assume you have a Raspberry Pi Pico soldered up with standard male headers in preparation for using it with the PiCowbell Proto. This page will show you how to solder a set of standard headers to a Pico.
(The shorty header assembly method uses short male headers on the Pico. The soldering concept is exactly the same, but use the shorty male headers on the Pico instead of standard ones. You can follow these instructions with the shorty headers and you'll be set for that.)
Follow the steps below to solder the standard male headers to a Pico. The process is the same for all flavors of Pico, such as Pico W.
Use the Pico to line up the headers on a breadboard. This is the easiest way to ensure the headers are soldered on straight.
Solder the pins on each end of the two header strips, so the four corners of the Pico are soldered. This ensures the Pico and headers are attached properly while you continue to solder the rest of the pins.
For a bit more detail on the process of soldering standard male headers to a board, check out the How to Solder Headers' Male Headers page.