I spent a lot of time early on trying different visualization and incubation things. I always tried to include something or someone in these to remind me that I was dreaming. I never did have much luck.
In fact, yours may be the first report of success I've ever read from somebody who experienced it first-hand. Congratulations on the success! It will be interesting to hear how this progresses, and whether anybody else has any luck with it.
One that I put a lot of effort into was carefully visualizing myself in a room with stucco walls, heavy wood door with iron hinges, and no ceiling - open to the sky. I can hear a sea from beyond the walls - the waves, gulls, breeze. . . I move slowly around the room, making my way around hand over hand, feeling the cool, rough and slightly damp walls. I feel my way across the heavy door, the hinges, and back around until I come to a window opening. My cousin T. is standing there in the window, and he tells me that I am dreaming.
Except I never seem to get that far.