Ha! Someone's playing a practical joke on me! Wiring is my nemesis, LOL!
I've added a few different sets of aux lamps over the years but always with a fight. That said I will do my best to help you out.
First though lets try a couple of websites where others do try this (different cars but if you have your manual you should be able to locate the same wires):
Jeep guy doing Hella 500s
Forester Forum with PDF wire diagrams
USMB Board info
Also RockhopJohn is pretty good with wiring and so is FM Green so you can also give them a shoutout.
Sorry I'm not the wiz you were told I am but cheers anyhow
Subh