Hi,
Get a utility knife and plenty of blades.
Very careful, with the knife parallel to the window, run it along the sides and bottom. Keep in mind where the open space should be. Don't try to do it on one cut. It'll take several passes. Do it slowly so you don't end up slicing the trim or your hand or something.
Don't forget to also make a cut between the inner and outer sashes. Cut very carefully at the top sides.
It isn't a fast process so don't try to do it quickly, okay? I'd feel bad it you posted in a couple days asking how to get blood off the walls ;-)
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