I released that I could crank out a song if I practiced it a lot. If I am in the practice of writing songs everyday or every other day, getting ideas and following through with them, and not just saying "I've got this idea, but I will get to it at some point." If I actually sit down and not be lazy, and follow through with it then you just get in the practice of doing things. It feels very productive, and then it gets a lot easier, because you are working the muscle in your brain. The "song-writing muscle" so to speak.