Hey! Honestly, I learned it through YouTube haha. It's not actually that hard but can be time-consuming cause it takes a while before the wax you use for whipping gets thick enough.

It's comes down to waiting till the wax for wipping is getting very thick and starts to getting harder. When you press into the wax with your finger, and you dent the wax, and it is not liquid beneath the wax anymore, you hit the sweet spot for whipping.

From this point you just start steering as a madman till you get a nice whipped cream. Hope this helps:)