1. Make a list!
Write down aka dump out all of the things you need to get done and would like to get done for the day.
2. Color code!
Use a highlighter to highlight the top three things you have to get done. Next, with a different color, highlight three easy things for you to do. Finally, with a color you have yet to use, highlight three things you can do after you've finished your top three and easy three.
3. Time to get to work!
Start with your top three. Once you've knocked those out, move to your easy three. If you have to time to do a few more things [and you actually want to do more] move on to your next three!