Classical conditioning is about forming associations, in this case positive associations with sounds or words. The good thing is that once classical conditioning has taken place, it’s reflexive, involuntary, so it’s INCREDIBLY powerful.
Some examples of classical conditioning exercises are
In order to create a reflexive response the exercises need to be done 2,000-3,000 times. If you can devote 5 minutes per day to each exercise you’ll have a reflexive response within 8 weeks.