The technique is quite simple. Think of blowing bubbles into your chocolate milk when you were a kid. Insert the valve into cold milk, a cold pitcher helps too. Then gently pull it up towards the surface and you will create foam that will come all the way to the top. It is easy to foam cold milk, so make your foam before you heat the rest of the milk. You can spoon it off the top of the pitcher for cappuccino or hold it back to make a caffe latte. At my cafe we made thousands of coffees and really anyone can do it with a little practice.