Android 4.2.2 Screen Capture on Galaxy Tab 2 10.1 I've browsed for  this information and everything I've found says to hit the power button and  volume down at the same time and a white line appears around the screen and you have a capture.

I've tried so many times and i just can't do this.

I can get blank the screen
I can make the Power Off, Flight Mode, Restart dialog appear
I can get the volume slider to appear
I can even get the volume slider to appear and power off dialog to appear at the same time.

I've tried pressing both together, pressing one and then the other, Holding one down and pressing the other, holding both down. I even tried pushing my tab against the desk, edge on, to flatten both buttons at the same time.

And after 30 minutes I still can't seen to get any screenshots, but I have rebooted twice.

Is there some that works on voice or shake or hold on screen that would allow me to do this?
It works out that you just have to keep trying. The Power and Volume down together (for around a second) will eventually yield a screenshot about 1 time out of a hundred. Took a look at most of the apps out there and they either need you to root the device or install loads of other stuff, work for phones rather than tablets or just don't work.

Guess I'm stuck with the crazy combination!