mate its easier than what you think!
the secret is to not worry about leaning the bike too far over, first concerntrate on getting in a good comfortable position where your bum is off to one side.
then open your leg as far as you can push it out.
have your head hanging towards the floor and not the other side towards the sky like alot of people ride.
then in 3rd gear just poodle around a round about (a dry non oiled one) and just gradually increase speed and lean angle.
you will be suprised how far a bike will lean over before it slides out!
my front end slipped the other day but i was trying to see if it was possible to get my elbow down!! lol.
here is my second attemp at knee donws and it feels great, starting to get the bike over further now too, sliders wearing fast!