don't forget the headlight washer reservoir level sensor, it's one wire to the instrument cluster. it's a nice addition and you'll have it anyway if you buy the SRA reservoir + pump
i think the step-by-step approach makes sense to some extend, but maybe it's good to transfer all the cables from the cabin to the engine bay in one go.
in your case:
6 wires for LED headlight: 2x (T14/10, /12 and /14)
8 wires for ALWR: 2x (T14/1 /2 /3 and /4)
1 wire for SRA
1 wire for level sensor
----+
16 wires
maybe make it a bit more if you ever plan to install heated windscreen, heated washer jets etc etc.










