Hard to say without knowing anything about your skill level or the horse in question or its training. How long have you been riding? Do you have experience training green horses? It sounds like you would be better off buying something a bit more seasoned, but there are a lot of variables.
I'm definitely not the most experience rider and there are always things to improve I have been riding for 3 and a half years but ride 4 to 5 times a week. I'm looking for a horse around 16 hands I prefer 17 hands they feel more comfortable too me and want to compete in jumping and flat classes . I'm open to hunter or jumpers.