Welcome to the forums! I, myself, had trained myself when i was 8 to wake up from a nightmare when i had recurring nightmares (gone now!)

Be sure to read up on the techniques to get lucid here. And don't be afraid to ask any questions! The people here are extremely friendly and will be glad to help you. People who's username are in green are called "Dream Guides", not to be mixed up with the dream Dream Guides.