Confidence in snooker and cuesports is a must and you do this by practicing a lot and being ready to play match snooker.
Self belief in your stroke and positional play shows in way you walk around the table and the positive manner in which you play the game and match.
You need to practice enough and have consistent results and commit 100% to the potting line.
Using a consistent sighting routine will bring positive results filling your brain with a good path to build on.
Positive affirmations is another way to build on your subconscious thoughts which helps control your conscious mind.
To do this write out sentences of what you want to achieve and write it 100 times a few times a day.
This will help get your conscious mind working fully and help achieve better results.