However you phrase it … your tone and overall demeanor will be as important in this message as your words. So is the time and place (of course in private).
The one thing that needs to be absolutely clear in your words, tone, and cheerful but firm attitude: You are not asking for any suggestions or counter-offers from your current trainer to help you stay.
But you need to be prepared for a discussion to follow, and in a way that you may not have expected. She may be unhappy with what she is hearing. She may want to change your mind – and your riding direction.
You have to be prepared to politely manage this. Don’t get into a back-and-forth discussion. Don’t try to justify why this is better than staying at this barn. Just politely mention the great memories and appreciation for her help.
And most especially, don’t give details about the new program. I made that mistake once, with a BO I was leaving that I considered a friend. She took it as direct criticism of what she had to offer and was seriously offended. Which took me by total surprise … anyway, avoid details.
“I understand. My parents and I have decided on this new direction, and I’m looking forward to it. I really look forward to seeing everyone from [this barn] at [wherever you will run into them].”
Choose a time when you only have about 10 minutes before you must go, and will go. This will forestall any protracted counter-offers to stay, or disagreement with your direction, etc.
Be prepared to stay calm, positive and upbeat, even if she is unhappy. While being clear and firm in a positive way.
You are not asking her permission. Or asking for her input or suggestions. But she may act as if you are. She may feel that she’s invested in you, and she may be disappointed.
Your overall demeanor and tone should help communicate that you have made a decision and are ready to move on to your new journey. Treasuring the memories and all of her teaching to date are appropriate, but they are the end point of this stage of your journey.
With your body language, you need to stand and sit straight. With your voice and delivery you need to be mature and calm, communicating your (and your parent’s) decision in an adult way. And not as if you are asking an adult for permission.
And of course, this conversation will be an experience that adds to your own maturity.
The desired outcome is an amicable shift in your relationship with this trainer. You are going from being a student and mentee, to being a junior friend. And if this friendship continues, it won’t be that long before you will be an adult friend in a community that you share. Even if it is when you are returning from college away to visit.
If all goes well you and she finish the conversation with mutual respect and friendship. If she’s upset and isn’t as accepting as you would wish, then you finish the conversation as politely as you can and move on with your life.
I have no doubts that you can do it!