Yeah, dude, don't overthink it. The harder you push, the less likely you'll be to dream lucidly, at least in my experience. I've rarely been able to travel to worlds that I've imagined. Usually I end up in some random environment that my brain generated. Best to just roll with it.

As for subliminal methods, listening to weird ambient stuff has given me some interesting dreams, but I don't know about it inducing lucidity.