Xenon retrofitting

Moin love community, I’m thinking if I should do a new project again. I’ve been thinking about retrofitting Bixenon. However, there are a few questions. If I get Bixenon headlights is the wiring harness plug and play or does it have to be pinned or new cables laid? Do I have halogen with ALWR at the moment. I just have to retrofit the SWRA and then encode everything via SD. But if you had to change the wire harness for the headlights I don’t think I would have any Feel like doing this to me.