Prepare a mug of hot water; generally, 4-6 fluid ounces is more than enough water. Hot tap water often works better than super hot boiling water because the lanolin emulsion can "break" if the water is too hot.
Add solid lanolin and allow to melt (~ 1 teaspoon per garment is a good starting point).
While lanolin is melting add a small chunk of lanolin soap and allow to melt too (for those that are exacting you can use about ~5-8 g of lanolin emulsifying soap per teaspoon of solid lanolin for great results when emulsified in a mug with 4-6 fluid oz of water which is 1/2-3/4 C.). Scented soap often requires a bit more compared to unscented soap because of the added oils and hard water often requires a bit more soap on average.
After a minute or two, when everything is completely melted, begin stirring.
Stir semi-vigorously for about a minute. A back and forth motion creates more turbulence and is more efficient than a circular stirring motion. The solution will become milky and frothy. Add to your tepid water bath.