Step 2: Preparation
Measure the volume of your mould in millilitres using water and a measuring jug if you have one. You will need a similar weight of soap base in grams. I tend to measure by eye and have a small mould (eg shaped ice cube trays) standing by for any excess, but it is initially difficult to guestimate the amount of soap you will need.
Chop up your soap and weigh it, then place in your microwave proof container. If you have the patience you could grate it - small, even pieces melt easier than big, uneven pieces.