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Change one wire at a time, if you pull both out of the outers its easy to mix up which goes where on the hub end. Leave a little slack on the cable lengths so it's easier to pop the endcaps in and out at the hub end, you can tighten up at the shifter but not so tight that shifting gets heavy. Like Mcamb said the enviolo vids are good.
@ffm depending on your needs Veloe have some solid midtails, lots of different gear options and you can choose between bosch and shimano motors too.
Gear cable snapped on my UA yesterday. After looking through YouTube videos I've ordered replacement inner wires & a cable end gadget. Fingers crossed; it's as easy as it looks. Anyone here have any advice?