Sorry - I didn't think to take photos.
Don't buy too much! I bought 12 sheets, but 8 would have done the job (about £10 worth).
No need to cover every square cm, but make sure gaps between the material are random. If you are super neat and make everything symmetrical you risk new resonances being formed.
Hit a panel with your knuckle. If it goes PinK! then it needs a pad - after fitting the pad it shout give a dull thud.