Step 3The Can
Or alternatively some clamps :]
http://static2.instructables.com/pub/F18/QQDK/F18QQDKQI6EQHO91YK.medium.jpg
Clamp the can down, get out your hammer and screwdriver (i guess a chisel would work too). Place the screwdriver towards the bottom of the can about as far from the bottom as you duct is tall. Start pounding the screwdriver in across the circumfrence of the can, making a hole big enough for your snips to go in.
http://static2.instructables.com/pub/FY6/UEE5/FY6UEE5DNCEQHO91XY.medium.jpg
Once your snips can be inserted start cutting away at the can, be careful not to be too zealous and cut it too big. But you want a hole not quite as wide as your duct and just about as tall.
http://static2.instructables.com/pub/FN8/VQTM/FN8VQTMZBKEQHO91XC.medium.jpg
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