Two constructions that both translate as "to have/get something done," but split on one question: does the action affect YOUR OWN body/person, or someone/something else's? Level 1 drills se faire alone, Level 2 drills faire faire alone, and Level 3 puts them head to head — Tier 1 (Recognize) with clearly unambiguous scenarios, Tier 2 (Trap) where the same verb goes either way depending on a small possessive cue.