Heeheehee. [Nepeta replies in a playful whisper of her own.] Purrhaps I've been doing it longer.

[She's being silly, of course: However trolls measure time, Nepeta can't be more than thirteen Earth years old.]

It just takes practice! Be careful of lighting fires during the daytime, too. You might think it's safur and the flames won't be seen, but in a wooded area, it's the smoke that will give away your location.