You said that you will have a trainer. That is who you need to ask your questions to. They will know how much the horse is trained and what the horse already knows.Posted via Mobile Device
There is a lot here that we have no information about. A green horse and rider combination is so often a bad combination due to the lack of knowledge of both horse and rider. If your trainer is also a good teacher for you, well, that is certainly a plus. Be prepared to give the trainer a fair amount to time to get the horse going safely and spend as much time as you can watching.
I have the feeling you have probably made a decision on this. Stay safe.
It's going to be an education.