You are doing very well, dont knock yourself at all. You have asked, you listened, you have looked how to apply that knowledge and you have learned. That's how all of us on built up knowledge and confidence.
Well done for uncovering the boot hinge wiring problems. Unless you have already been to buy the cable I would suggest you order a metre of automotive wire in each required colour rather than general wire from a general DIY store. Wire made for automotive use is a bit more flexible which is quite important for the hinge area which is subject to vibration and movement. The insulation layer is thinner but more durable than ordinary knock about wire. It's also best to match the existing colours. Joint are best soldered and covered with heat shrink tubing
On my way to B&Q I thought about whether or not I should get automotive wire specifically. With needing to be mobile in the car this weekend if I can, I opted to get something cheap for now to give me a temporary fix (and to confirm that the broken loom is the cause), and then the specific automotive wire I've ordered should be here for me to replace it all during the week next week.
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