For testing purposes, you can pour a candle without a wick. Once it has completely set, you poke a hole in the center using a skewer. Put the wick of choice in (no tab), trim wick, and heat gun lightly in place. Once it has set yet again, you're ready to test that wick. If you find that it doesn't work well --too much hang up, too hot, etc-- you yank it out, heat gun the hang up (if any) to erase memory of previous burn then wait till it sets. When ready, repeat process of putting in another wick.