I believe that raising kundalini is like emptying your trash - not a goal in itself, but (should be) a natural result of the other endeavors and obvious "signals" on your way. Chakras open and close, and change their "mode" all the time, to a certain degree, when a need arise. This "certain" degree is something that develops naturally - if not forced. I'd rather focus on goals, rather than technicals (which raising kundalini is).