How simple is the installation of a Netgear range extender?

Expanding WiFi coverage is a complicated subject, involving many factors.  For many of us, relocating the ISP connection to a different part of the house is not trivial.  In this particular case, having the Telstra connection in the downstairs office enables a solid and fast connection for devices in that office.  Were it convenient to move the Telstra connection to a more central location, that would entail having devices in both offices connected over WiFi.

Not aware of what WiFi systems are readily available in Australia.  In the US, there are several mesh WiFi "2-packs" available for $140USD or less (roughly equivalent to the $200AUS cost of that Netgear WiFi extender.  If WiFi from the existing Telstra router in the downstairs office is weak in the upstairs office, then a mesh WiFi system may not sync well at that location either.

I would be more comfortable purchasing from a vendor with a liberal return policy.