Homeopathy is very hard to repeat experimentally precisely because of the way it works: Individually. This is a hard pill to swallow until you've seen it work. But when you have seen it -- it's the easiest one of all.
Part of what makes a homeopathic interview successful is the synergy between you, the patient, and your homeopath. There must be a give and take, a relationship of trust, and an open dialogue.