If you're a weak personality yourself, you probably won't try it. This is far more involved than the therapy. If you've taken out the emotions from a seriously upsetting event, the person will have a personality change. The person will be more even tempered and things which used to upset him will not do so any more, or at least not so much. Hurts and fears are easiest.
Angers are harder.
The person's mate or associates are the ones most likely to note the personality change, much more so than the person himself. As this website evolves I will give more details on how to treat various conditions. Each person should have several things you can disconnect them from emotionally. If you're a weak personality yourself, you probably won't try it, for fear of losing face. You have to get over that.