In the contemporary world of psychology and psychotherapy, Hypnotherapists and the practice of hypnotherapy have carved an essential niche. Hypnotherapists, the professionals who practice this method, use hypnosis - a state of focused attention and heightened suggestibility - to aid their patients in addressing various issues. But the big question that lingers in the minds of the uninitiated is: how does the whole process work?

To understand the role of Hypnotherapists, one must first delve into the concept of hypnosis, derived from the Greek word 'Hypnos' meaning 'sleep'. However, contrary to popular belief, hypnosis is not akin to sleep, but rather a deeply relaxed yet fully conscious state where the mind becomes highly responsive to suggestions. This state is not dissimilar to being engrossed in a captivating novel or a riveting movie: the external world fades as focus intensifies.

The hypnotic state can be self-induced or facilitated by a Hypnotherapist, whose primary role is to guide a person into this state of deep concentration. Once achieved, the Hypnotherapist employs various techniques like suggestion therapy, analytical hypnosis, or cognitive-behavioral hypnotherapy, depending on the needs of the patient.

Suggestion therapy revolves around the power of positive suggestion, wherein the Hypnotherapist makes beneficial suggestions that the patient's mind is more likely to accept in the hypnotic state. This technique is commonly used to help in managing pain or changing negative behaviors like smoking.

On the other hand, analytical hypnosis seeks to find the root cause of a disorder or symptom. It's based on the theory that the answer resides within the person's subconscious mind, and the Hypnotherapist's role is to guide the patient to discover this hidden information. This technique has been useful in treating deeper issues like fears, phobias, and traumatic experiences.

Cognitive-behavioral hypnotherapy combines cognitive behavioral therapy (CBT) and hypnosis. The Hypnotherapist uses hypnosis to help the patient to challenge unhelpful thoughts more effectively. It's shown promise in treating health-related conditions, including chronic pain and irritable bowel syndrome.

The efficacy and application of these techniques vary, as each has its particular advantages and disadvantages. Suggestion therapy may work quickly but might not be as effective in managing long-term or deep-seated issues. Analytical hypnosis, while potentially transformative, can be a lengthy process. Cognitive-behavioral hypnotherapy, while comprehensive, requires a practitioner skilled in both CBT and hypnosis.

The 'when' of hypnotherapy application is dependent on the presenting problem and the patient's readiness. Frequently, it is used as a last resort after other methods have failed, but increasing empirical backing suggests that it may, in fact, be beneficial as a first line of treatment for certain conditions.

In terms of 'where', hypnotherapy has an impressive range. From clinical settings to wellness retreats to self-help contexts, the application of hypnotherapy is vast and varied. It's also noteworthy that modern technology has extended its reach even further, with online hypnotherapy sessions becoming a promising prospect.

The 'why' of hypnotherapy is its potential to access the subconscious mind, which is believed to hold the key to our behaviors, emotions, habits, and physical health. By utilizing hypnosis, Hypnotherapists can bypass the critical conscious mind and work directly with the subconscious. This direct approach can make change more accessible and manageable, leading to profound transformations in individuals.

However, it’s important to note that while hypnotherapy can be a powerful tool, it is not a magic wand. It requires the commitment and active participation of the individual. Furthermore, it is not suitable for everyone – some people are more suggestible than others and will respond better to hypnosis.

In conclusion, Hypnotherapists, through their specialized knowledge and skills in hypnosis, provide an intriguing alternative to traditional forms of therapy. By understanding the underlying principles and techniques, it is possible to appreciate the 'who', 'what', 'where', 'when', 'how', and 'why' of hypnotherapy. Despite ongoing debate and research into its mechanisms and effectiveness, one thing is clear: hypnotherapy is an intriguing field that continues to push the boundaries of our understanding of the mind.