The first obvious step is to decide 'why' you want to go back to school and weigh that positive decision with the negative aspects associated with your decisions. After this point, you've still decided that going back to school would be the best decision, you have to prioritize and be disciplined with your actions. I've highlighted the actions necessary that has made it successful for me:
1. Establish exactly how much time you have to spare each day for school work
2. Establish a same time each day to work on school activities
3. Plan out segments of work needed to be done each day to prepare and execute your necessary school work
4. Most important is to stay disciplined to your process and try to get a bit ahead everyday than your original thoughts.