Do you swear on Neuro Linguistic Programming?

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A while ago I determined for myself in which way I have to improve myself in order to be happy with myself. One of them was: being more confident and social. So I googled a little bit and came across Neuro Linguistic Programming or NLP for short. After having read some information I found out about Paul McKenna and listened to one of his courses named: I can make you confident. It contained a track with messages addressed to the concious mind and one for the subconscious mind. I've been listening to the latter every night and I have to say I'm seeing some results. - Have you ever followed such courses? Do you think it works? - Are you interested in self improvement, either via NLP or other methods?