This is probably on here, but I'm positing anyway.
I am one of those that has had LD's naturally for years. When I was a child, I could control certain parts of my dreams, but never understood it or why. I also could not make it happen. It just sometimes did.

I wont bore you with everything up front, as I'm posting blindly and it may have been said a million times before.
Try your best in a dream to do something simple that you know isn't right. If you are ever in an experience where you think you have control, do not try to fly. As you may read on here it is very difficult. I have only recently (this week) been able to do so. Start with common sense.

Example, after I found this website, I thought, "huh, This is a real thing? I can do more?" So....the first time in a dream I thought I was dreaming I stopped, counted my fingers. I made a conscious decision to count them, knowing that I have ten. When i counted them in my dream i had eleven. Right then i know that i was in a dream because common sense tells me I have ten, not eleven. Don't let it freak you out. Just use it to help you realize. As soon As I counted and realized I was in a dream, I fell half way through the floor, because the first thing that happened was I realized the floor I was on was not real. Crazy.

the second example is when I "woke up" in a dream. I was lying there and everything seemed real. I couldn't tell if I had really woken up or if I woke up in a dream. with my arms spread and my fingertips on the mattress, I said to myself, " If this is a dream, let me make this bed a water bed." Immediately the mattress started moving as if it was a water bed. Normally I would have moved and woken up, ruining the LD. But doing this instead, allowed me to stay in the dream and start exploring.

Just try to remember to ask your self common sense questions and you will begin to explore like never before. In my experience, If I don't convince myself first, it just startles me or freaks me out and I wake up and ruin the whole thing.

Much love, and happy dreaming.