1. Do: lift your wrist. Don’t: rest your wrist on piano keys. Even though it sounds sooo basic, but yes some of pianists still do this lazy-man gesture.
2. Do: put your repertoire at the front holder. Don’t: put the repertoire on the floor.
3. Do: normal feet position. Right feet to push the right and middle treadle, left feet for left treadle. Don’t: cross your feet. You’re playing piano, not attending arisan ibu-ibu.
That’s all, thank you and hope it helps (I know it does). Bye!