For an even easier and quicker version, don't bother separating the milk - just mix everything in one bowl, let cool and fill your moulds to the top. Bob's your uncle ;)
Metric kitchen scales are an inexpensive yet invaluable gadget to ensure accurate measurement of ingredients. Store them upright in a cupboard or over your worktop and they'll only take up a tiny bit of space. Click
HERE for the ones I use. For U.S. option click
HERE.