Just get good at paying attention to bodily sensations. It might help to actually try saying things out loud, or writing them down, just going through a list of everything you notice about how your body feels right now. What you will tend to notice over time is that there are certain characteristic familiar patterns of how you are feeling.
The most competent people I know are pretty good at basically anything they put their minds to, because they just design a process and run it. I think this is largely mental and emotional—the hardest part isn’t figuring out the steps, it’s enduring the psychological discomfort of doing them and then adapting.
A leading indicator of personal growth is how curious you are able to be with all your emotions - especially the ones you weren't allowed to feel as a kid.