imo your makeing a wise choice not getting a ray... for the above mentioned reasons.. and when trying to move even a 4" disk ray... it's potentially dangerous. Rays should always imo be handled by adults ( not saying a kid or teen could not "handle" one.. because honestly most fish crazy kids would probably handle the fish better. all about liabily and not being a imo bad parent. I wouldn't let my daughter handle a venomous snake either.) There is a risk factor, even if you didn't get a "major" sting, any sting can have seriouse consequences if not properly cared for. Haveing that understanding and respect for them should always be forefront when houses/keeping them.
Thanks