Take a small green candle and go sit somewhere quiet. Take a deep breathe in, and slowly let it out. Now light the candle and place your left hand over the flame, close enough you can feel the warmth but not close enough to burn yourself. Take that warmth and pull it into your body, from your toes... to the top of your head. Burn the candle for as long as you need it or snuff it after you are done.
If you need to heal a specific place, after you have brought the warmth all over your body, pull all of the warmth wherever you need it, like a leg, a wound, or an organ. This can also help with blood borne things, just let the warmth flow through your veins.