The most important tip: if the lid is closed and pressed down to open, it creates a small temporary overpressure when pressing so some liquid from inside will be spat out. To avoid it, I always first loosen the top a tiny bit just to break the airtight seal first. Then press to open, twist a little again to lock and there's no spray of tea out.

In general, knowing the mug's limitations and setting the right expectations helps. It has tiny capacity at 350 mL and does not last long when out and about (a couple of hours at minimum temp setting of 50°C) and it gets scratched quite easily with use. I love it for tea on shorter bicycle rides and at work when I can refill it from a thermos.