first to become "lucid" you must realize you're in a dream state... in other words you need to be (i think) semi-concious, and able to recognize something while dreaming. (This something should be proof that you really are dreaming). (this is why a dream journal helps, since you can recognize patterns in your dream from the past to find hints on what to look for to know you're dreaming in the future)

once you can do that you should realize that you can't be hurt and have the power to do anything (this part confuses me, since i ussualy wander off in my dream (ex: omg im frozen in ice i must be dreaming... oh hey sweet the sky is green, that pwns). Then you should be able to control things by knowing you're dreaming, in other words fly and own ppl you hate in 1 hit. If you seem to find yourself in trouble (or about to wake up) then you can spin your dream (which confuses me again). When you dream spin, i think (assuming) you're in the 1st person view (which isn't allways the case) you spin around and you should find yourself in a new place.

thats my view from what i've read. im confused though, since i can become lucid, but once im lucid i tend to wake myself up or never remain in control, accept for once i felt my body becoming super heavy and i tryed to push myself up off some ice then i woke up. (yeah i have to wait 2 weeks also to get a tutor, should be changed to 1 )