Do you set expectations on yourself, on others or both? Do you consider them to be a good thing or a not so good thing?
How I see it is, there is nothing wrong with having expectations but be prepared for when it turns into disappointment. For it is how we handle the disappointment that really makes the difference! Disappointment is not something you ever get used to, although some may beg to differ on this.
So the simple lesson from turning expectation into a habit and having it become your reality, is to not make a habit out of it in the first place and remember to expect the unexpected and as a result, you will never be disappointed!