The best advice I can give you is to go see the horse. Spend some time with it on the ground, then ride it for at least 20 minutes. Some will say not to go with a green OTTB since you don’t have a lot of experience with them, but you said your BO has a lot of experience with Thoroughbreds. If the BO is willing to help you then don’t let that deter you. I went with a green OTTB as my 1st horse. They’re definitely a different breed but that’s not a bad thing. The most important thing is to make sure you fit with the horse. I rode my guy for 20 minutes after spending at least that much time on the ground with him. If you fit you’ll know. Being from SE PA you have access to vets that specialize in Event horses. I’d suggest you vet your pick to see if there’s any physical limitations or issues that’ll hamper your ability to reach your goals (yes, anything can happen regardless of vetting I know).
Another thing to consider is don’t pay too much attention to confirmation. Look at it, but don’t let it overly affect your decision. I leased a 1* Prelim horse that was so pigeon toed you wondered how he walked. But he was really great at dressage and loved to jump the moon.
Once you pick your mount spend the time in the beginning to learn your horse’s personality and quirks. Build that bond first. After that the rest will come a lot easier. I spent the first 14 days on the ground getting to know my guy before I rode him. That paid off in spades when I finally did climb up on him for the first time.
Thoroughbreds are amazing horses that will give their everything for you! In 18 months mine went from Green OTTB to schooling Training Level. They’ll take you where you want to go!
Good Luck and Best Wishes!!
