Our life is frittered away by detail...Simplify. Simplify. ~ Henry David Thoreau

Simple does not mean easy. De-cluttering, purging and letting go is one of the hardest things to do. I find when I am stressed it is because I have too much stuff; either possessions, activities or emotional stuff. Getting rid of physical extras can be easier but things often have emotional baggage too. Baggage with baggage, so American. Activities are hard to get rid of because they are fun or "necessary". Emotional stuff is well, emotional. Three things I have learned that help me simplify are:
1) Saying, "No".
Just because it would be enjoyable, or is a great deal or even free does not mean it comes with out obligations.
2) Asking myself, "do I really need this"
The answer is almost always no. We all have wants but almost none of them are needs.
3) Forgiveness
There is so much power in forgiveness. Choosing to love someone and to forgive is so much harder than choosing to be right. True forgiveness brings peace and healing. Being unforgiving only leads to anger, bitterness and sorrow. Forgiveness ASAP also helps. The longer you stew the harder it is to forgive.

Accept the things you cannot change, have courage to change the things you can and have the wisdom to know the difference.