The half-somersault manoeuvre is meant to be self-taught and performed, but, depending on how dizzy, fit and healthy you are, it may be difficult to accomplish. It is an alternative to the Epley manoeuvre, which can also be self-administered. You can read more about the half-somersault maoneuvre here.
Alternatively, you can see a vestibular physiotherapist who can help you with the manoeuvres, both teaching you how to do them and performing them for you. You can find a Vestibular Physiotherapist in your area here. Choose “Find a Physio” or “Find a Clinic” and select the “Advanced Search” option. Enter your criteria, including your city.
I couldn’t help but notice that you mentioned in your email that you suffer from Ménière’s Disease. Note that these manoeuvres are aimed at positional vertigo, which may occur in Ménière’s disease. Positional vertigo presents as short-lived episodes of spinning dizziness that occur only when you move your head in certain ways. On the other hand, Ménière’s Disease presents with intense spinning (dizziness) episodes, that come on suddenly, often for no apparent reason. These are often accompanied by vomiting and last for hours. The manoeuvres for positional vertigo are not recommended when these longer and more severe episodes occur.