If you are having a hard time getting your dream recall up, I would suggest using the mantra AFTER you go through your day. You want the mantra and your intent to be the last thing on your mind as you are falling asleep, that way you will have the highest likely hood of remembering your dreams

Also, there are special lucid dreaming alarm apps that you can download. They come pre-installed with alarms that are designed to shut off automatically so you do not have to move, and they come with various alarm tones that are very subtle to help keep your mind from waking up too much. I would suggest just doing a simple google search to find the alarm that best suits your needs Eventually, you can even train your mind to perform a WBTB naturally, without the use of an alarm clock. This is done very much in the same way that you remember your dreams, through the use of auto-suggestion and mantra's.

If you have any other questions, please feel free to ask!