Your mind is extremely powerful and can affect the outcome of your performance –for which we have no definitive explanation– but we do know that believing that you are going to perform well will certainly have a positive effect.
Once the body knows what to do — like walking — let the positive thoughts in your mind take over.
When you step onto the green, believe you can make the putt you are presented with.
You might not make it, but by believing that you can you will give yourself a better chance of success.
Understanding The Fundamentals of Putting and applying them until they become habitual will help you build this confidence and belief.