I haven’t been able to fly in an LD yet, but I flew in an ND once using an “endless jump”. Basically, I jumped into the air and didn’t come down. I also had the idea to close your eyes, visualize yourself flying, and let the visualization become your dream scene. Oh yeah, don’t forget the method of using a jet pack or some other object to fly!
I also tried two methods without success: the first is to close your eyes and imagine what it would feel like if you were flying. Then, open your eyes and you should be flying. It didn’t work for me, though. The second method is to “step into flight”. It’s kind of like stepping onto invisible stairs, and once you aren’t touching the ground anymore, start flying! That didn’t work for me, either. But they might work for someone else.