It really is not necessary to take the temperature of the oils or lye water unless you are doing fancy stuff.
Definitely not ... but for a new person it's a Good Idea (TM) because when she says "did I get false trace?" we can ask important things like "how hot were your oils and your lye?" Without that information we'll be guessing. A new person also has no reference for cool, warm and hot. A quick pull of the trigger and all is very clear.It really is not necessary to take the temperature of the oils or lye water unless you are doing fancy stuff.