I agree with what fOrceez is saying here, nowadays most of my LDs come from an awareness of how the dream literally feels within my body and everything around me. It's when I catch on to this feeling that I'll do an RC to confirm that I am dreaming

During the day the two most common RCs I use are to count my fingers and the nose plug. Both are extremely reliable for me, though I have had the nose plug fail when I haven't been expecting it to work properly. I generally do them any time I see, hear or feel something strange, or just when I feel like it. Whenever I wake up during the night, I also make it a habit to look at my large digital alarm clock and do an RC using that quickly, and this has let me catch many FAs before

The key to any RC is to use it to confirm the suspicion that you are dreaming - and relies on you really having the intent that they will work. Really question if you are dreaming every time you do an RC, and take a second to think about where you are, what you've been doing and what's going on around you. Do this, and your RCs will never fail you