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Personally I think you should forget the technique, if you are thinking about what to do next and what is supposed to happen you will ultimately hinder yourself. Just relax like you would on a beach, you don't have to picture images in your head as it is all about disassociation, you want to disconnect from your body so don't worry about picturing stuff.
When I first started meditation I used to spend 5 mins thinking of as many things as a I could, eventually you start to run out of stray thoughts. From there just control your breathing at a comfortable rate, if you were anchored down then it is probable you were thinking to much or not deep enough. The problem with reading about other peoples experiences and following their techniques is that your mind wants to force certain things to happen. Just let the body relax, as you improve there will come a point when it is hard to stay in your body.