“Works suprisingly well. If you do not have a kit for hammering in the header, I used a breadboard and a small flat piece of wood. Standing the header and my Raspberry Pi Zero 2 W over the breadboard with the wood on top of the header I was able to tap it into place without damaging the pins. Everything works as expected.”
Sorry to hear you had trouble here - if you send more info/photos of what went wrong to support@pimoroni.com we'll see if we can use it to improve our documentation?