Hello @Nina1664 and welcome to the Community Forum … and congratulations on securing sitters for your first listing in June!
With regards to your question with regards to whether it is too soon to be thinking about September, I have attached a couple of other posts that you might find helpful.
If you have any other issues or further questions then please don’t hesitate to ask, we are all more than happy to help.
Whereabouts are you hoping to travel to this year?