The act of "stepping" or rising from your body itself can be felt in numerous ways.

The most common is a heavyness in the body, sleep paralisis while being aware, overproduction of energy (tingling, hot and cold shivers, an intense vibration right through your midsection) then a dull humming or ringing in the ears that grows stronger until the mind detaches from the body to create a sense of numbness and lightness, as though you are floating.

Then as your body drifts to sleep your mind and soul remains separated from it, hanging just above it. All you need to do then is get the hang of seeing and moving about in spirit.

I'm sure many others have had similar and quite different experiences.

That's just the general gist of it.