Keep your heels down and move with the horse. Steady hands and keep elbows in.
Toes out and heels down. Also move with the horse not against. Don't lean forward and go at your pace.
Make sure to wrap your legs around the horse and don’t lean forward.
It feels terrible the first time. Try asking for a beginners horse that's forward. It might be tempting to lean forward and stand up. Just be brave sit back put leg on and enjoy the ride