A useful practice, to be used when you first sit or whenever you need to collect your thoughts and center yourself, is that of watching the natural flow of breathing. For this, be still and let the body breathe. Experience the actions of breathing while observing the process. Doing this can elicit relaxation as well as easily remove your attention from involvements with outer conditions and mental and emotional states. When you are somewhat calm and centered, proceed with meditation.
Speak this positive affirmation:
Watching the natural flow of my breath I am relaxed, centered and I easily flow into my meditation practice.
Have a good day . . . and a great life!