Which bit are you struggling with? It’s fairly straightforward, just connect the acewell loom to the OEM connector that’s already in the headlight shell. You don’t need to use all the extra bits of wiring that acewell include in the box. The only other thing is to swap the mechanical speedo drive for the new electrical one, and that’s just a single connection. Don’t bother with the oil temp sensor.
I agree the instructions are pretty rubbish though!