I use a heatgun occassionally for modelmaking. One thing I would say, is try your absolute best to get into the habit of NEVER touching the metal end where the heat comes out with your hands and NEVER setting it down on anything that even has a chance of setting alight or burning. Never ever. Not even when it's cold.
Reason being, I didn't do this and was only careful when it was actually on or being used in that moment. So I got used to picking it up any old how when it was cold and setting it anywhere when it was cold. Then one day I used it, carefully as I always did, turned it off, and set it down on the floor - which was all safe and fine. But then after maybe a couple of minutes I absent-mindedly moved it to the sofa cos it was in the way. Luckily I quickly remembered it was still really hot and grabbed it before it set the sofa on fire. But unluckily I grabbed it by the hot metal end and burned my fingers pretty bad. It's so easy to forget those things take a LONG time to cool down. Hence why now I make a habit of never touching the metal end or setting it down anywhere unsafe even when it's cold. It's just better to ALWAYS do the safe methods, then you're less likely to forget yourself when distracted.