When psychics talk about what they "see", that is where there "see" it, in the "mind's eye".. not usually with their physical eyes. When doing healing, it is helpful to know that the energy body is polarized like a magnet or a battery. Top/right side is positive, bottom/ left side is negative. (an electrical polarity, not a judgment of quality.)

Energy tends to go up the spine like blue fire and down the front like cool rain.

The energy travels from the right hand to the left, through centre to recharge and back. Left hand absorbs energy. The energy of crystals can be felt more readily with the left hand.

Right hand offers energy:
   Buddha is often depicted with the right hand up, palm facing out to the viewer, like someone swearing an oath.. he is offering Shaktipat, the transmission of the awakening energy.. a gesture of greeting, a blessing. His left palm is usually facing upwards or downwards. Sometimes, over the heart.

Image the light entering the top of your head into your heart, and beaming out from the right hand palm and fingertips, toward the person you intend to heal. Be sure to ask permission before sending energy to other people, as projecting energy can have unexpected side effects if there is not consent.
  This can be done long distance, but often distance work also travels thru time, to be received at the best possible moment.

For close up work, healing burns and bruises and such, send your energy through them at opposite polarities, as magnets must be opposite poles to attract. Two people sitting facing each other holding hands, makes a perfect circuit. A circle of people holding hands creates a larger one.

 Imagine that the space between your hands is like the filament of a light bulb, the part of your electrical circuit that gives off healing light energy. Hold hands facing, or put your right hand lower and your left hand higher on/above their body. Send your energy thru opposite to what their circuit is. Place your hands according to the reverse polarity on either side of the injury, and imagine the filament is inside them, and the injury is gathering golden/white light and beginning to glow. Do this until it "feels" complete.
  Then use your imagination to lock the glow in place, imaging them grounded, so that it is being fed from their own energy source.

Or just send energy and watch where it goes. Particularly with muscle aches, the source of the pain is often at a different location from where the pain is felt. Back problems cause aches elsewhere, digestive weaknesses affect whole other systems.