#8 Try out the horse yourself
When one particular family with limited horse knowledge asked for my help to try out a horse for their daughter, I was happy to oblige. On riding the animal in the arena I achieved 3 good paces before taking it for a hack through a wood. Even when jumping a fallen tree, the horse behaved impeccably. He was alert and forward going, and I saw no evidence he had been given a special treat to make him subservient. The teenage daughter of the family rode the horse in the arena after I had finished, but only at walk. After the horse was vetted and bought the family complained it would buck with the daughter. Again I rode the horse, and again he behaved impeccably. Later that day I received a phone call to say the horse had bucked yet again, and the daughter had fallen.