Use a utility knife and, if necessary, a hammer to carefully break and remove any caulking or sealant that's binding the old sill to the window frame. Use the crow bar or chisel to slowly pry the windowsill off the window. Proceed with care: Keep the sill in one piece so you can use it as a model when cutting the new sill. You may also need to pry away trim material, known as side casing. Set it aside for later reattachment.
Some sills are sloped downward so rainwater runs away from the window. If your sill is sloped, you'll also need to remove the wooden supports that are lifting it up. Newer homes may use beveled wood sections, which should come off in one piece. Any other piece that interferes with removing the sill must go, including decorative pieces under the window.
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