the approved technique
Following the approved technique is excellent - but make sure that what you are told is "approved", actually is. For certified aircraft, an approval is provided by the authority under whose regulation the aircraft flies. In the case of "G" registered, the UK CAA, "N", the FAA etc. For anything operational, the flight manual, and any applicable supplements will be the "approved technique" for that aircraft. So look there for how to fly the plane, and checklists. That'll be all you need, because it
is approved!
In the certified aircraft sense, "approved" means that a competent authority has found that the aircraft meets the design requirements.
Other entities (like flying clubs) do not have the authority to approve aircraft, nor their operation. They may impose standard operating procedures/guidelines, which are their
preference, as they own the plane (things like do not land at uncertified runways, or no solo practice forced approaches, for example). But those SOP's should not conflict with what the manufacturer prescribes, and the authority approved for the plane, otherwise, what is the authority doing, and why do we want certified planes?