Do you see now why self-hypnosis can be potentially dangerous? Imagine leaving your house and giving your key to a total stranger. Would you do that? Why then would you leave your mind in such a vulnerable state for others to slip in the odd suggestion every now and then? Worse still, if you don't know what you're doing, you may very well leave your mind open to suggestions even after you think you've secured your mind once the self-hypnosis session is over.
Total Garbage. Are you sure you're not working with that dumba$$ at Quackwatch?
It takes a session of relaxation to suggest anything to your subconcious because your conscious mind is being bombarded with hundreds if not more stimuli every second and you think somebody can walk up to you in the conscious mind and suggest something that would harm you when they haven't set it up with a SH session beforehand. Get real