You can't avoid the 171 varieties of cheese at the grocery store, complex work situations, or the challenges of raising a family. What you can choose to do each day is only put yourself in situations where the stress is worth it.
The four most important words in the English language are yes, no, hello and goodbye. They are, at once, the most commonly used words and the most profound.
If you want to develop free will, your first step is to recognize and accept how often you operate with little or no awareness. Then you need to choose whether you want to do something about it.