I had assumed, however foolishly, that taking screenshots on the iPad was pretty much the same as taking them on the iPhone.
It is, and it isn’t. You still use the Home and Sleep buttons. The sequence in which you press the buttons doesn’t matter, but the rhythm, so to speak, does.
1. Hold down either the Home or the Sleep button.
2. Press the other button—Home or Sleep, the one you’re not holding down, and release it quickly.
If you are successful, you’ll see a brief screen flash of white to alert you that you’ve been successful. If not, you’ve succeeded in putting your iPad to sleep, and haven’t managed a screen shot.
The screen shots will appear in the special “Saved Photos” album accessed via the iPad Photos application.