Do not be Scared , make Shure and ask if the horse Is Quiet , ask the owner , this means is it safe for young children , if the horse is not then do not get in its back . A good experience helps when the owner does not do stupid things like putting a new rider on a Hot horse , good luck and go for it , I grew up on one :) Usually when you hear of a first time rider being Hirt it is due to the horse owner not parting up the right animal with the rider experience ... Good luck
Totally agree with the girl above... My first ridding lesson was awesome .. They paired me up with the most amazing horse they had,I barely had to do anything!! Go for it enjoy your ridding ! Make sure you tell the owner it's your first time and they will know what to do!