People always ask what technique I use and I always have to tell them I use willpower. I expect the LD. I will use the odd technique here and there though. Whichever’s more convenient.
One thing that I do do frequently though is imagine the feeling of getting lucid. Imagine that feeling of realization when a ND turns into a LD. Imagine the excitement and get into that state of mind. If you’ve had a LD before, you’ll know how it felt. Well, remember that feeling before you go to bed. It’s giving your subconscious a very clear idea of what has to happen that night. I find feeling is a ton more effective than repeating some words over and over. Your subconscious works better with emotions anyway.
Obviously this will only work if you’ve already had at least one LD.
Hope this was helpful.