As with everying in life.. Stop thinking about it and just do it. No trying, just clear your mind and let yourself dream, remember if something strange happens you are most likely dreaming.

When you do start to Lucid dream, do not think at anytime that you can do what you want as this will wake you up.

Let the dream take you somewhere and change it slightly or change the dream, if you are scared you will wake up. To change the dream is simple, stay calm and rational and take advantage of what your mind has to offer. Doing too much at once will wake you.

Best to just explore your dreams in the first couple of LD's take a look around. believe you can fly and you will fly, if you have trouble think of an birds eye view. As similaries have helped me control my LD.