No, worst case scenario is you can’t get your horse leased, at all, period, end stop. JHF is in the middle of the summer, and middle of the summer is not a fun time to try and get a yearly lease signed. Circuit is in full swing, year end points have been accumulated, and Finals are still months away. You have some HS juniors that know they won’t be around to finish the 2025 season and will do an August to August lease, but most mid-year leases happen because someone’s main horse went lame.
Getting your horse leased out for the numbers you are thinking is in no way guaranteed, and I might even venture it’s unlikely. I would absolutely not assume the horse you’ve seen on an internet site is going to get that “public” asking price. BigEq has been running posts on it since November.
Have you consulted with your trainer about this, as I assume they would be working as the agent? Have you had a professional evaluate your horse and said, yes, I think we could get $XX/yr, and I will be taking X% of that? Horses commanding those kinds of numbers are generally very well-represented. They are also usually in tow and at shows, so they are available for trials, and those trainer/agents are making good money billing for full-care, absent-owner costs. If your mare doesn’t lease in those 30-45 days between JHF and school, she will need to go into training at your trainers place.
I’m really not that invested in what you go on and do. I have Garth Brooks singing Unanswered Prayers in my head for the first time in 20 years, but you do you. You’ll learn something, one way or another. This just happens to be my wheelhouse, so figured I’d chime in.
And if this helps, I turned pro by picking up a job teaching up/downs and riding, well, everything, during college. I had no desire to go pro as a teen, I was in college to go do Real Job things, it just… happened. And now I can’t get rid of it lol. All that to say: It is not hard to “go pro”. Like, you’d have to actively try not to if you are an able-bodied youngster willing to get on anything. Being a successful pro? Whole 'nother basket of worms. You won’t find that out until you’ve spent 36+ wks/yr cutting your teeth on the circuit as someone’s crash test dummy. And if it ends up being something you don’t want to do (I’d say like 80% of us starry-eyed teens eventually come to this realization) you now have to figure out a way to pay for the damn things.