Hypnosis works, if you're willing to believe and to let it work. It's like the old saying goes 'I think; therefore I am". You get out of it, what you're willing to put into it, and it does take practice and patience, so if you're disappointed that you didn't see instant results, then that may be the problem all together.
I've tried it the other day, and absolutely nothing.
I've tried it today, and felt some 'tingling' like one feels when their leg is about to fall asleep and felt a lone 'finger' trace around by balls (which actually caused me to jerk)
So I haven't experienced the full-blown 'tickle attack' but with enough trying, I am convinced that I will, one of these days