Well then I guess even a "lock tight" diagnosis has a 15% chance of being wrong. But if anyone feels that self-diagnosing themselves offer a better success rate then, well, he/she should do as they see fit. The medical world has its faults, as we all know. Yet I would trust their diagnostic judgement over what I can do.
Case in point. Years ago I developed skin lesions. Could I determine if these lesions were a result of an infection (bacterial? viral? fungal?), eczema, Psoriasis or something else? No way. So I went to a dermatologist and he misdiagnosed based on his visual assessment. Only through a skin biopsy was an accurate diagnosis (of psoriasis) made. And of course, skin biopsies aren't something one should try at home. ;-)
But to be clear: even though I think the medical community has the upper hand when it comes to diagnosis the situation is entirely different when it comes to treatment, especially for a chronic complaint. The medical community indeed often dumps toxic "medicines" that at best only alleviate symptoms, hopefully with minimal side effects. As an added insult these poisons are very expensive. Yet by doing extensive research one can often come up with a holistic alternative that is more effective, safer and FAR cheaper.
PS - going back to my example, my derm first misdiagnosed my condition as eczema. I fear there are many eczema suffers and Psoriasis sufferers who are misdiagnosed because their doctor did not go the extra distance and have a skin biopsy done. Although both conditions can often be helped similarly through dieting/supplementing, an eczema sufferer who is misdiagnosed with Psoriasis would be in a world of hurt (and lost money) if he/she started to take immune suppressing meds. It would be a travesty. Sadly, I think this is not an uncommon occurrence ... all because the doctor was too lazy to do a skin biopsy.