You’re never going to get it out if you keep finding reasons why you can’t write it.
According to this schedule I’m putting 13 days of work into the time it takes a physical week to play out. I could say to myself “Oh this is too much, I’ll get around to it when I’m less busy” and then the holidays will arrive and you will find something else to distract you, you will never get around to it. This is why you should start right now. Pull yourself together, find your balance, learn the tricks to save time and take every opportunity given to you. I may not sleep this semester, I may have half an hour each week in which to write, but I’m damn well going to use it.