Some individuals will schedule classes that conflict with job. Thirdly, don't put off things that must be done. Procrastination is a common human trait that can be disastrous. Don't put things off until the last moment. This is called managing your activities by continual crisis which will put you under continual high stress.
Some stress can be a stimulus for higher achievement.
If you were not under some stress, you probably wouldn't do your best. Look at athletes as an example. Stress gets the adrenaline working. The problem comes when we put ourselves under too much stress. Everyone has a certain level of stress.