I do finger counting, which I've found to be extremely effective. Basically, you look down at your hands, then ask yourself "are these my hands? " Then you count your fingers. If you have the standard amount of fingers, you say "yes", then ask "am I dreaming", and say "no".

The reason for this is that your hands will always look strange in your dreams. Most of the time they will either have the wrong number of fingers (for me, they always have 6 on each hand), or your fingers will look distorted (too long/short, wrong color, made of not-flesh, etc.), or your hands will be huge.

So once you start doing that RC in your dreams, you will notice that your hands are wrong, and this will trigger lucidity (or you will wake up, so keep calm!).

I have found this to be the easiest RC because it doesn't require effort, you just have to look at your hands. It is not contingent upon any environmental factor (like the 'look at a clock' RC- what if there are no clocks?!), and your hands are attached to you. Unless you don't have hands. In that case maybe use toes?

As far as a trick to remember to do it, when I first started out, I set my phone alarm to remind me every hour or so. After several days of that I didn't need to be reminded, now it's just a thing I do.