For me it usually begins with a low volume rushing sound, but often I can turn it louder just by concentrating on it. After a wile the sound turns into something that is more like ringing, I would describe it as a vibrating sound wave. I then just let this get louder and more intense until I can feel my body vibrating and hear this really loud ringing.
Afterwards I just wait until it stops again and just stand up with my non-physical body in a copy of my bedroom.
The vibrations and sound are basically trigger and indicator at the same time. After the vibrations fade off, you might think that you are still just laying there with your physical body and actually miss the opportunity of just entering the LD. I had that happen to me a couple of times before I realized that I was in an LD already and didnt have to wait for anything else after that.
My success rate with this is pretty low though, I can do this maybe once every 2 weeks and usually only with WBTB.
Hope that helps.

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