How do I even find the prostate?

So I’ve been into anal stuff for a while, but I don’t think I’ve actually ever gotten a feel for what’s going on down there. A lot of people mention that you should feel with your finger where the prostate is and what it feels like in order to get a better understanding.

So what’s the best way to feel it? Do I squat down or do I lay down? How far in am I sticking my finger? What am I feeling for? Will I know it when I hit it? How hard do I press?

Sorry for all the questions. Thanks!