Theory on why things dont work
Many people say that when their dreams are very real they have a hard time with control, and nothing works. In a normal dream however, one your not lucid in, you can do anything. So this got me thinking.
Maybe the more you think about something, the harder it is to do it. When your not lucid your not thinking about anything, you just do stuff like you have always done it, completely normal. When your highly lucid though you think more clearly and so think about stuff before doing it.
Some times you learn to do stuff though, and you can do it all the time while lucid. This is because you expect them to happen. Its not because things happen because you expect them but because your so sure you put no thought into it, you just do it, like you would when your not lucid.
Would also explain why you just can't seem to do stuff some times, even if you have done it a million times before. The more you keep thinking about it the harder it is. I don't think you can't do stuff, but they just get harder the more you think.
What you think about that? Maybe someone who flys a lot can try standing on the ground before doing anything and say "I am going to fly, I am going to fly" over and over in their head, then think about how they are going to do it and try and see if it seems harder.