Compassion meditation involves silently repeating certain phrases that express the intention to move from judgment to caring, from isolation to connection, from indifference or dislike to understanding. You don't have to force a particular feeling or get rid of unpleasant or undesirable reactions; the power of the practice is in the wholehearted gathering of attention and energy, and concentrating on each phrase. You can begin with a 20-minute session and increase the time gradually until you are meditating for half an hour at a time. If your mind wanders, don't be concerned. Notice whatever has captured your attention, let go of the thought or feeling, and simply return to the phrases. If you have to do that over and over again, it is fine.