I always use mantras after RC and before bed. Also wrote them down in my DJ I keep on my bed - I tend to remember things better when written down. I started to do Sporadic Awareness Technique, but I still do mantras - I really believe in them. My very first LD (MILD/DILD) was on a same day I started to say mantras and do looking at hand and finger/palm RCs. My main mantra is "Everytime I'm dreaming I realise I'm dreaming", and to this I add Stabilise lucidity and Increase clarity now, in hope, that I will remember to say it in my dream.