A stress free life is practically impossible. Stress is the response to the challenges. Challenges are caused by the goals. Achievement of goals are called success. In short no stress = no success. So stress is a good thing but most of the stress in our life are unnecessary. You can easily eliminate this unnecessary stress by applying simple (or not so simple)baby steps. Off course it cannot be done overnight as I have been doing it for a while and I still have a lot to do.
You have often seen the articles of how to relax after a stress full day, and most of them are really quite useful. To further the quest, I made the goal to get the source and cut the stress before it even happens. (Yes. The same as X-Men. Days of future Past).
To nip the evil in the bud, I have devised a list, and by editing your life according to it you can eliminate most of (not all) of the stress in your life.
This one’s drastic! Probably too drastic for most. But in absolute your work is your greatest stressor. If you are doing what you really love, you are from the band of very few who are termed as lucky. But if you are from the unlucky ones, find out what interests you, what makes you feel good. Do it regularly. Take time for it from your busy schedule. For the sake of your work, quit work. Do what ever make your soul happy, and when you are doing it do not think of work make sure you have quit work.