We recommend that you use a double boiler, even just putting your pot in a pyrex baking dish with water in the bottom will prevent the fire hazard as well as keeping your beeswax and oils from browning from too much heat.
If your beeswax is too hard, soften it in a bowl of hot tap water for about 10 minutes and it will be ready to grate.
Find beeswax
here
Lip balm tubes
here