The technique I used when I was younger was blocking my nose and trying to inhale through it at random points throughout the day. If you're dreaming, you'll be able to breathe through a blocked nose. If you turn this into a habit, you'll eventually do it inside of a dream, and become lucid.
The second necessary component is developing your dream recall (it's no use having lucid dreams if you can't remember them). You do this by writing down your dreams in as much detail as possible every morning when you wake up. At first you may only remember a couple of dreams every month, but do this often enough and you'll eventually work your way up to remembering 5-10 dreams every night.
The second necessary component is developing your dream recall (it's no use having lucid dreams if you can't remember them). You do this by writing down your dreams in as much detail as possible every morning when you wake up. At first you may only remember a couple of dreams every month, but do this often enough and you'll eventually work your way up to remembering 5-10 dreams every night.