Brace a small crowbar against the side of the window frame and pry off the trim laterally across the face of the glass. Don't brace the crowbar against the glass.
Separate the caulking or putty that surrounds the window pane by running a sharp utility knife around the perimeter of the window, between its edge and the inside face of the window frame.
Push the glass outward from inside the house. Have a helper outside to control it so it doesn't fall on the ground and break.