The biggest thing is getting it lit real good before putting it in. Sometimes takes 20 minutes of off & on attention.
Below is a good link for you to check out.
The Video is real good, and my comment is #2 on that thread.
Thank you, sir. Makes perfect sense. Your narration in the video says that a heat gun is not necessary, just a lot of air. I read several fellas just blowing on the coals. I suppose a hair dryer is sufficient as well.