You'll have tack strips all along the perimeter. Start by pulling the carpet up there to loosen it.
Depending on how big the room is, square, etc
You might want to just roll it up in one shot. If its not square, too large, etc. pull it up off the floor and cut strips of 4 foot. If you don't care about the floor under it, just run a sharp CARPET BLADE (not a regular razor) without lifting it.
Roll it up... Carry it out.
There will be padding under it. Hopefully it comes right up but really old stuff might stick to the subfloor (sucks!)
WEAR A MASK.
PS: WEAR A MASK and consider googles
Malo periculosam libertatem quam quietum servitium