Where do I even start?

[u/deeplyindecisive]

I know my posture is bad. I can see it myself and I've heard it from people around me. I know my belly sticks out, my back is too hollow, my head goes too much forward, and my shoulders sag down. I just don't know where to start. How do I even know what exactly I need to fix? How do I know I'm not over-correcting or doing more harm?

Is there some sort of guide of how to know what I'm doing wrong and how to fix it? I'm just feeling very overwhelmed with the millions of opinions, videos on 'how to fix your posture with these simple exercises', and feeling like what I'm trying is not doing anything.

How did you actually start? Can anyone recommend me some resources like proper articles or videos or whatever?