I've bought kits from aliexpress numerous times, I have not had any trouble. The important part is to pick a vendor and stick with it, as you can't be sure that strips or controllers from one will match another. If you already have ambient lighting from factory, there are kits on aliexpress that should be quite plug and play.
I bought from "WY Car Store", but would probably buy from another vendor as no long dashboard light is included. I needed to add a resistor to their 100 cm strip to make it match the brightness. Bought 3 extra 74 cm strips for center console and AC.
Knowing how to solder is also a great help as you can use scrap pieces for speakers etc:
https://f30.bimmerpost.com/forums/sh...ostcount=14475