Can I write my own stress meditation script?

Yes. Start with a short grounding step, then slow the breath, then guide attention through the body to release tension, and close by returning gently to the room. Keep the language simple and warm, write in the present tense, and build in pauses so there is time to follow along. Reading it aloud helps you catch anything that feels rushed. StillMind can also generate one if you would rather not start from scratch.