If you are scared to solder, or don’t want to go to the expense of buying one, there are a few things that you just can’t do with the Raspberry Pi. It’s true that many add-on boards come with their GPIO headers fitted, but some (like the Pi Zero and pHATs) need them soldering on. Well, Pimoroni to the rescue. They’ve developed GPIO Hammer Headers – you take the header, press it into the relevant holes, put a plastic jig around it and then… hit it with a hammer. The headers have special little “nubbins” that go through the holes and then grip the back side of them. Ingenious! You can buy the headers for a few pounds from the Pimoroni website.