Notice your mind, now feel your feet, did the quality of your mind change? Often, this is enough to see something. Rather than feeling your feet, which you can do, though you generally don't... or feeling your back, similarly, Zen practitioners simply feeling their 2nd chakra. Through that alone they appear to be able to reach the highest levels.
There is another style which feels the whole body. Having some awareness of the body allows the subtle-body to begin to form. This will over time help to release energy-blockages and eventually activate the whole energy system. The only requirement is to keep from "putting gasoline in the water tank" (aka, over-stimulating your system with non-stop entertainment, just to have to clear out everything put in), and keep from exhausting the energy-body as it builds up (aka, staying up to 3am every night, or non-stop sex, etc...).
As you progress along your experience of existing will, well..., it is tricky without a teacher to tell you that you've fallen back into old habits, or that you are doing well. But, once you are able to see how you drain yourself & cut that out, and how you "loose your center" so that you can get it back, you can make progress. The progress is to catch yourself doing something that makes you tired, and stop it, over time your energy increases (sealing up the holes in the water bucket, such as eating heavy meals).
You'll experience your system coming to life, then do something to back up a few steps, and you'll get there again... and avoid the things to pull you back, over time more and more progress towards another kind of existance...