Never let the possibility of only getting a little done stop you from getting anything done
Often times I find that I feel like I can only get a little done and end up not getting anything done. I think it works far better to get what you can done, and try again tomorrow. At worse you'll getting a little done every day and eventually have a lot. Perhaps you'll end up getting a lot more done than you expecting. Too often I'm frozen into nonaction, and I wish for it to stop.