Reminds me about positive thinking. Yes, it does work, if the right preconditions come together, not under one's own mind immediate control. But then, out of overenthusiasm not recognizing the subtlety in prevalent or not prevalent preconditions, successful patients want to help others. In what suddenly seemed easy. Without understanding the precise mechanism or lack of body and mind preconditions at work, for decades in their own case.
As also seen in this otherwise inspiring case. 30 years just to have the precondition to look a bid deeper, obviously even here wasn't under the own mind's control for that long. Even with immense suffering it brought.
All superficial psychological and relaxation methods are freely and openly available, these days, if one searches for. Sometimes they work, sometimes they don't (due to preconditions). But yes, if one doesn't feel confident enough to search it out on one’s own, one can go shopping.
But, buyer beware only applies if one doesn't understand the inherent limitations in such services. This course costs about 600,-. With most psychotherapists, this would be maybe 6 sittings only? In most cases, not really making a dent. And 1 success story doesn't tell the many more untold stories without success.
A 10-day non-profit mediation retreat costs about 330,- for boarding/lodging here. But even in this case, training in self-reliability without dependence on guided meditations afterward, results of a course may vary too. There is a reason monks meditate every day their whole life. And its preconditions present or not present, again.
Most people don't have the body and mind preconditions ready, to be able to.