Here's Starhawk's Grounded Meditation...how to connect to ground (but not really how to meditate.) It's a good way to start meditation. Get grounded. Set your wards. Work the magik you know from your cells.
I like how she ends with the needs for us to know how to ground or center ourselves in an instant, after having practiced this many times...whenever we are confronted with stressful events.
Just say to yourself, breathe, center, be safe. Now reach out.