I wouldn't take this advice. The 'moar speed' is not for better when you're first learning butters. As well, butters are easier on non-traditional camber skis, and you would have to exaggerate the lean forward much more on a traditional camber ski.
Tail butters are easiest to learn going from switch to forward (sw. butter 180). Start by going switch down an easy, groomed run. Initiate your turn/spin at the same time as you start to put pressure on your tails. You should feel like you're slightly sitting back on your tails. Continue the rotation with the pressure still on your tails until you're facing downhill.
Nose Butters are easiest to learn going from forward to switch (nosebutter 180). Start by going forward down an easy, groomed run. Begin putting pressure/leaning forward on your noses as you initiate your turn/spin. Continue the rotation with the pressure still on your noses until you're skiing switch.
beanpicker is right on!
Exactly, the best way to learn is to start slow. Once you feel comfortable with buttering on groomers, try it off of the lips created by catwalks. Nose/tail butter 3's, 5's, and 7's just take time getting comfortable with. As you become more comfortable with basic butters, start going with a little more speed and start working towards bigger spins.
Once you've got them locked down on groomers, its time to take them to boxes/rails. Only when you feel really really good with groomers, little lips, boxes and rails should you take it to jumps. I think a lot of people watch pros like Delorme nose butter cork 7 and they believe its not much harder than a regular cork 7. Watch Lolo's recent butter in one of the Europe big airs- they don't always go as well as planned because they really are a fucking hard trick! There's just so much that can go wrong with buttering with a lot of speed off a jump.