4. Saying No
Sometimes it's easier to say yes, but don't feel like you always have to say yes to everything in life.
It's not being selfish to say no to someone--you have to look out for yourself and put your priorities first at times.
This is especially important when you have an overload of tasks.
If you added another task to the list, you will most likely not do your best work.
So just say no!
There's no harm.