Get dressed in safety gear, and then measure all your ingredients using a kitchen scale.
Combine the lard, coconut oil, and mango butter in a double boiler over low to medium heat.
While oils melt, add lye to the distilled water in a well-ventilated area. Mix until fully dissolved, then let sit in an ice bath to cool.
When both the oils and the lye water have reached 115°F, add the lye water to the oil in a large mixing bowl. Use an immersion blender to mix them together until they reach a light trace.
Add in essential oils and blend again until trace.
Pour your soap into your soap mould. Let it sit somewhere warm for 48 hours.
After 48 hours, unmold your soap. Cut it if you used a loaf soap mould.