Yup, just keep firing it until it goes "HISSS".

There's nothing you really need to be aware of (the bloke from the US).

Be advised, you may want to loosen the action block a little, to give the cylinder room to turn past it.

The action can scratch the blueing on the tube otherwise. It should be hand tight, so you shouldn't need to put anything in a vice. Just put the action between your legs and twist your tube ( )