In my experience you don't generally have to teach them to that
They can manage it pretty well with no tuition at all
( CaptainCrackerjack live trout, slow motion, Wed 23 Jan 2013, 18:20, archived)

You still have to hold the ladder for them though

( Grrrmachine the indifference engine, Wed 23 Jan 2013, 18:22, archived)

Touché, old boy

( CaptainCrackerjack live trout, slow motion, Wed 23 Jan 2013, 18:23, archived)