Is a cheaper green prospect a bad idea for a beginner?

A green prospect is almost always a poor choice for a beginning reining rider, and the financial savings of a lower purchase price are almost inevitably outweighed by the costs, difficulties, and setbacks that develop when an inexperienced rider attempts to work with an untrained or minimally trained horse. The fundamental problem is that a beginner and a green horse are both in the process of learning, which means neither can effectively teach the other. The beginner needs a horse that can produce correct responses when the rider's aids are approximately correct, so the rider can feel what correct feels like and develop the timing and feel that reining requires. A green horse cannot provide that because it does not yet know the correct responses itself. The green horse needs a rider who can recognize correct responses, time releases precisely, and apply aids consistently enough that the horse builds reliable associations between specific cues and specific responses. A beginner cannot provide that because they are still developing the very skills the green horse's training requires. The result of putting the two together is almost always mutual confusion — the horse does not learn correctly because the aids are inconsistent, and the rider does not develop feel correctly because the horse's responses are not reliable. Beyond the training problem, green horses are also less predictable in their behavior than experienced horses, which creates safety considerations that a beginner is less equipped to manage. The lower purchase price of a green prospect typically becomes substantially higher in actual cost when the professional training necessary to make the horse usable is factored in, making the apparent savings illusory compared to purchasing an already-trained horse from the beginning.