1. Find something small, even unimportant, to work on. It feels rewarding just to keep moving forward, and that makes it easier to go back to tackling something big.

2. Step away from the keyboard and do something else entirely, even goofing off. Sooner or later, you'll be consumed by a burning desire to move your project forward, and you'll probably benefit from a fresh perspective. (If this lasts more a day or two, see #1).

Above all, remember that guilt, stress, and burnout seldom help you get from A to B. Keep calm and carry on.