Its not to hard to do. The lights should come off without to much disassembly. The front grille and those 2 plastic inserts either side of the grille need to come out. 3 bolts and the headlight comes out with a mad twisting action.

With regards to the HID. ( assuming your using stock ballasts etc.) Stock location for the ballast is behind the front bumper on the supports.
If your using after market hid kit. Find your low beam wires. Cut the plug, rejoin onto ballast. Cut grommet hole in the back of the lamp cover, fit up & test.

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2016 Subaru Outback - Work Wagon
350NM of CVT Goodness
Pit Crew, shit talker.