From my childhood I already could magnetise, although I now know I never did it how you suppose to do it.
I just put one had above the place and added positive energy to that spot. As result that place became warmer which then helped to cure that spot, but thats not what you should do.
Let me explain a bit of background information on what magnetising does.
Everyone has an aura. This aura is a magnetic field that surrounds everyone. You can use your own field to change someone else's.
First, you locate where the area is you want to threat (usually just by asking LOL), then you place both your hands around that place in such way that your hands are parallel to eachother with that spot within, making sure that you're approx. 10 cm from the body.
So, if someone has a chest pain, put one hand on the foreside, and one on the backside where that point is in the center. Its not bad if one hand is much closer to that area than the other, as long as its in a parralel way. If you don't have it in a parralel way, it won't be that effective.
Once you have it in the right way, start visualising that one arm (the one that is furtest away from the pain area, if there's not much difference, choose one you're confident with) is adding positive energy. Picture yourself a flow of energy coming out of this hand. The other hand has to the the exact opposite. Picture yourself that negative energy is being attracted to it, so you get a circulation of energy that goes through the spot.
Once you have this circulation established, start moving both hands away from that spot so you eventually move it outside the body. Move slowly though. This way you'll move the magnetic disturbance outside the body quickly and effectively.
If you do this for about 5 minutes, stop the procedure, and make sure you get rid of all the energy you've collected. Do this by literally shaking it off your hands. Think about that that energy makes your hands wet, and you can only shake it off. (a towel won't help, really!

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Be aware that not doing it right, will cause you to start feeling the pain from the other.
Once you've discharged yourself from that negative energy, you can begin the above procedure. Do not do it too long, or you'll start to feel the pain on your end.
You can even try to do it on yourself. I can for instance, do this on myself, but remember: don't do it for too long, cus if you take away energy that gets back there too, it won't do anything anymore.