Can someone help me find a method on how to ground myself with my surroundings? I've heard I just have to connect the teeth of the anti-static mat/wrist strap onto the case, but I also heard I can connect the teeth to my connected-to-the-wall PSU while it's switched off. Same goes for the mat. This will be my first build, so I want to play it safe, both for me and the components. Any advice?