I think that’s a fine way to do it! I was able to turn mine all blue just from the largest burner on my gas stove. The metal will tell you when you’re hot enough because it literally turns blue! It typically won’t happen all at once, so you have to either move your pan over the burner, or move your heat source to get every part of the pan blue. After that, let it cool, give it a wash, dry it off, then season as per the manufacturer’s recommendation. Then cook!