Today, dedicate a set amount of time to work on a task, say 25 minutes.
(If you can’t do it today, commit to a time later this week.)
Define your goals for that 25 minutes, set a timer, and go!
After 25 minutes, take a break and evaluate your progress.
If you’re feeling motivated, check out pomodorotechnique.com for an entire organization dedicated to this technique!
(We’ll call it the pomodoro technique–a pomodoro, Italian for tomato, is a nickname for a kitchen timer.) Be sure to read the Pomodoro Cheat Sheet, and if you’re really motivated, this 37 page pdf on the pomodoro technique.