Big Congratulations if the horse passes its PPE
One of the first things out of my mouth after I shook hands with the Seller was:
"ok, I have bought this horse and I'm not changing my mind; please give me the straight skinny on any personality quirks and what you are feeding?"
From what I've read on these forums, boarding barns are generally very gracious about helping the horse transition, so the hay should not be a problem.
Excellent idea on transitioning the hay but it's also prudent to know what they put in the horse's feed pan. I would want to know if they are feeding any extra supplements?
As long as the horse is doing well on its current feed, if you can stick with the same thing, wonderful; if not see if they will part with five or ten pounds and try to find something similar. Unless it's sweet feed
--- no no no, a thousand times no on the sweet feed. That's like giving your daughter a gallon of Hi-C and a dozen Hershey Bars for lunch and it's doing nothing but giving the horse "false" energy and possibly setting the horse up for metabolic issues later in life
Since you're in a boarding situation and don't have to worry about barn/fence safety issues, that's about it for crucial things.
Just sit back and be the standard nervous wreck everybody is when getting a new horse - especially first time owners.
Enjoy that and some wine for about a day, then it will be business as usual.
My family farmed with horses until I was four and my granddad raised Welsh/Morgans. I have never NOT had horses in my life, so I take an awful lot for granted; even though I sometimes look at questions and go "huh?!?", I haul myself up short and remember that everything from brushing a horse to picking hooves is a big deal to new horse owners.
Meaning, ask many questions on this forum, no matter how silly they might sound. It's important to KEEP the horse well-mannered and safe to ride. All-too-often the Longtime Horse Owners read "this isn't the same horse I bought six months ago".
Horses don't ruin themselves, people ruin them, so it's important to know how to properly (and fairly) handle the horse so it respects the human as the boss whenever the human is in its presence
Annnnd in order for us to be any sort of help---------------------we MUST see pictures of it