The Truth About Rook Piercings
The rook is in a very particular spot above the daith. It can be a delicate spot to pierce, so the piercing can take six to nine months to heal, depending on how diligent you are in your post-piercing care. London-based piercer Rhianna Jones told Byrdie, "It is always advisable to try to avoid sleeping on any new ear piercing until fully healed as it can cause problems and delay the healing." To keep it healthy, clean it regularly (and carefully) and don't remove it, even temporarily (via Bustle). She also recommends a titanium or 18-carat gold bar for the initial healing period (it's also what she offers her clients).
In terms of pain, it's not one that's going to have you sobbing, but be warned — it will definitely hurt more and for longer than your regular lobe piercing, just like other piercings that involve cartilage, such as a tragus piercing. Even though it's not the most painful piercing you can get, you're not going to want to try piercing it yourself. It's always recommended that you find a professional piercer to do this work for you.