Make your goals achievable. Don't fall into the New Year's Resolution trap and make a whole list of things that there is no way that you can accomplish. As you make your goals, create statements that will motivate you to do your best. It's OK to stretch yourself - just don't go so far that you get discouraged and give up completely. Equally important, give yourself permission to fail.
Nobody can accomplish every goal that they set for themselves.
It's OK to fail. We all learn and grow from failure. If you fail to achieve one of your goals, look at it as a learning experience, dust yourself off and start working on the next one. Finally, keep track of your goals and allow yourself to feel that sense of accomplishment that comes from know that you've done a job well and accomplished what you set out to accomplish.