Ok. If you don't have a dream journal, start one. You would be surprised, how many dream signs you will find. But, dreams signs, although could be helpfull, are not required. You can do RCs+awareness in daytime at totally random times. That way, in your dream, you will do RC at totally random time also.

WBTB indeed is great tool. And it can mess with your schedule, especially, if you don't have enough sleep and you get up early for school. You could try WBTB on weekends. During week, concentrate on DILDs.
Happy dreams