The instructions are very much step by step, everything is colour coded and easy enough to follow.
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The Traxide kit comes with everything you need, down to cable ties and electrical tape. Also drivesafe (aka Traxide) is very approachable if you have any questions. The instructions are very simple and step by step down to how to cut and crimp the connectors to the wires.
The other really nice thing is you don't actually cut in to the existing wiring harness of the headlights, rather piggy back off it. This means its easily removed from the vehicle if desired.
If you don't want to install it, it'd be a quick job for an auto electrician.