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Ok there is no easy way other than to climb under the sink with a set of box spanners and remove the nut if your lucky it will come off quite easy. You will need to turn off the mains cold water and depending on your hot water system the main feeds to your hot supply
This is the sort of thing i use
I dont know what the vokera mini is.
If its a Combination boiler when you turn off your cold mains supply it will also turn off the hot.
If however you have tanks in the loft and a copper cylinder there may be a tap in the cylinder cupboard that will turn off the hot water supply.
If not you will have to turn off the cold mains water and tun a tap until the tank is empty.