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Positive thinking is certainly better than negative thinking. That is, an optimistic outlook is more likely to pay off for you than a pessimistic one. Henry Ford is supporsed to have said, "Whether you think you can or you think you can't, you're right."
What is expected tends to be realized. But you can't just force yourself to believe something if there are fixed ideas to the contrary residing in your subconscious.
You have to get past your conscious mind to talk to your subconscious. Hypnosis allows you to do this. Positive thinking, however, may just be your conscious mind talking to your conscious mind. Saying something doesn't make it so. And don't count on some mysterious vibration or current reaching out to take care of it for you.
Once you truly believe that you can, say, make a million dollars (positive thinking version), don't plan on just sitting back and letting it happen while you think about it. You still have to do the work, but now you can move forward without sabotaging your own efforts.
Positive thinking may even reinforce the negative thinking you are trying to get over. Consider the old game where somebody tells you to think of anything but an elephant. Anything at all, they say, just not an elephant. Try it! Of course, you will think of an elephant. If you try to force your positive thoughts, you may end up spending more time thinking about the habit you are trying to break, which makes it more a part of your consciousness, and harder to get rid of.
If positive thinking has worked for you in the past, it will work for you even better when you do it in a state of self-hypnosis.