All previous suggestions are really good. I would just add, that when I say my mantras, I visualize whatever I'm saying and I try to recall a happy feeling from previous lucid dream, or any other happy occasion. And I really try to feel the happiness going through my body. This tells my brain, that becoming lucid in a dream is something that makes me feel good and since my subconsious wants me to be happy, it will try harder to give me a lucid dream. I also believe in my mantras and really believe, that whatever I'm saying is/will happen. Don't give up. I only hade 4 LDs so far, but practising Sporadic awareness, mantras and RC-ing and hoping for another one soon.