I always thought a watch pressure test was similar to hitting a piece of glass with a hammer to see if it can withstand it. If it doesn't break it passes, but if it does break you are left with a load of broken glass. In the case of a watch if it fails the pressure test you end with a water damaged watch. I'm assuming there is more to it than that though.I did watch a vid on YouTube, and with the correct tool, looked pretty easy tbh
But I’m pretty clumsy, so chances of doing something wrong is high !
I’ll just take it to a watch shop in town, not going to bother with a pressure test though, I never wear it in water