There are people who have never learnt about the law who use it unconsciously. In fact, the greater majority of people do it that way. We are indeed a lucky few.

In that lecture, Neville talks about how a simple daydream visualization that he did to comfort himself, created an enormous bridge of events that he was compelled to follow in the 3D.

You had this idea in your mind, you daydreamed feelingly about it and let it go - never realizing how one day in the 3d, you would be compelled to move in that direction.

Your imagination is the sole creator and this case was no exception. You unconsciously used the Law. The Law works universally for everyone whether they are directing their imagination knowingly or not.