You're question is a bit vague as there are a lot of variables in the scenario. Generally people are only willing to do trades if there is an even value. And you'd have to find someone looking to trade in their more experienced horse for a greener one... to make that an even trade the green horse would have to be pretty spectacular AND/OR the experienced one would have to either just be average or have something that will decrease his value. Perhaps a mild soundness issue or is getting up there in years. What we'd need to know are details like what level was the jumper/eq horse competing at? How successful was he and how prestigious were the shows that he has done? How old is he? How easy is he to ride? What we'd need to know about the green horse is, how successful will he be at his future job, how much training has he had, how much of an attitude does he have, etc. Do you know what the experienced horse is worth? Sometimes prospects go for more then experienced horses but finding the right person to trade may be tricky.