I use this same thing when I try to wake up for a certain time and it works for LD’s too! Very simple.
This might not work for people who’ve never had an LD before. You brain needs to subconsiously know what a lucid dream is.
Lie in your bed and spell “lucid” over and over until you fall asleep. You will wake into a lucid dream. While you’re doing this, don’t get all excited and keep thinking about getting an LD, just keep spelling the word.
This is kind’ve like hypnotizing yourself.