The greatest problems I have with this "Song A Day" are 1. setting aside enough time for this, 2. having the will to compose during said time, and 3. having the creativity to make something good.
In spite of all this, I'm glad I'm doing it. Improvement is miniscule but noticeable to me, in how I plan out and think about how the piece is going to go. I just got to stick with it.