How you going there GB.
What machine or model saeco are you using?
The cappuccinatore is a simple but effective device. You are right, it will pull the milk out of a recepticle, heat and also add air to the milk.
1.If you want more air for a cappucino, you pull up the pin at the top. But if you are after a flat white or latte make sure the pin is all the way down as it will still add air in this position.
2. After pushing the button to extract the milk wait until you see the milk climb up and through the tube and when it is about to come through and into the cup place your cup underneath overwise it will make your coffee watery.
P.B. One down fall is that if it is milk straight out of the fridge you will get a nice warm to hot coffee. Which is great for us who enjoy the flavour of a great coffee, but some people prefer it hot!